Again, the comic doesn't show the full size of the Mando army, because IT FOCUSES ON JANGO FETT.
If there were only 17 Mandos on Galidraan, it wouldn't warrant a response from the Jedi Order outside of maybe one or two Jedi being sent. The Trade Federation blockaded Naboo, and the Jedi sent TWO guys to settle the matter and help the Queen defeat/talk down the Trade Federation. Would they really send a strike force of Jedi to defeat 17 Mandalorians? Whereas sending dozens of Jedi to defeat 300 Mandos does make some semblance of sense, since the Jedi do remember the Mandalorians as a threat from the past, and there's at least several hundreds of them.
Also, you want to talk about Open Seasons' portrayal of the Mandalorians?
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Mandalorians in Open Seasons go down like flies. As if they were fucking Stormtroopers. Their beskar armor might as well be paper-mache.
The comic focuses on JANGO FETT being the badass, while making every other no-name Mandalorian mook look like an expendable goon, which includes Jaster Mereel, their former leader before Jango took over.
In that comic, Jango was also portrayed to be the idiot who started the massacre at Galidraan by opening fire at the Jedi:
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So the Jedi can't be blamed for what happened at Galidraan. All they did was answer a 9-11 call, show up at the place, and the Mandos started shooting at them. It's as I said before: I don't care what galaxy you come from, a man shoots at you, you kill him.
And throughout the battle, if we only look at what the comic shows us, less than a dozen Jedi died:
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So this isn't a case of the Mandos being so badass they took down plenty of Jedi, when in both cases, less Jedi died when compared to the Mandalorians. And if we focus only on what the comic shows us, the "battle" of Galidraan might as well have been nothing more but a backyard brawl. Not a showcasing of how badass Mandalorians are, but a backyard brawl where one Mando posed a threat to the Jedi, while the rest got slaughtered like pigs.
And of course, the same canon that has that comic has the Bounty Hunter game, which had Komari Vosa, Dooku's pupil (the "loudmouth" that Jango wanted to shoot in the comic) say this:
Komari Vosa: "Ah, the blast helmet of a Mandalore warrior. Something I've not seen since I was a Jedi. I must have cut down 20 of your kind myself."
And no, you can't count Open Seasons as canon yet relegate the Bounty Hunter game as non-canon, especially since the latter covers the contest that Jango won that had him selected as the clone template, the resolution of his rivalry with Montross that started in Open Seasons, and the explanation as to why Zam Wessel was working with Jango Fett.
So obviously, there were more than 20 Mandalorians on Galidraan, considering that a Jedi PADAWAN cut down 20 of them herself in that battle.
So no, you're picking and choosing which parts of the comic count and which ones don't. Which goes how disingenuous your argument is.
If anything, the whole "300 Mandalorians" argument makes the Mandos look better. 300 Mandalorians died, but dozens of Jedi died as well. As opposed to less than a dozen Jedi dying TO ONE MAN while the entirety of the Mandalorians got their clocks cleaned by the Jedi. The former makes the Mandalorians as a whole seem tough despite losing hundreds, while the latter makes Jango look badass while the rest of the Mandos look like rookie Stormtroopers.
And again, the Jedi have proven their mettle in leading men to war, as even Republic officials can attest:
https://web.archive.org/web/20091025123730/http://www.holonetnews.com/47/news/13314_2.html
"Relying on Planetary Security or Sector Forces is a stop-gap solution, as the inefficiencies of the Stark Hyperspace War so painfully demonstrated. The solution is obvious -- a unified military coordinated from Coruscant. Our ancient history has proven this has time and again -- the Great Sith War, the Kanz Disorders, the Virujansi Uprising -- times when a unified Republic Navy and Army were strong. And now, as then, there is still a role for the Jedi in today's galaxy: leading an army to victory."
-Republic Judicial Terrinald Screed, arguing for a unified Republic Army and Navy, Holonet News Point/Counterpoint on the Military Creation Act
Republic military officers wouldn't be begging Jedi to lead armies if they suck at it. The only reason Finis Valorum was iffy about Jedi being generals is because they had no army. Something which Jango, Dooku, and the Kaminoans have solved by creating a clone slave army for the Republic to use.
And of course, if Karen Traviss was right about the clone trooper numbers, the Jedi managed to hold off quintillions of battle droids (the size of the CIS droid army according to the Episode III Incredible Cross Sections) with just 3.2 million clone troopers. Damn, that makes the Jedi Generals out to be the greatest military masterminds in the galaxy's history! Geez, I didn't know she was THAT much of a Jedi fan! XD