OK - time to let my inner sperg out a bit.
Grosskreutz was absolutely in the orbit of Joshua Ziminski that hour, but did not seem to be as close to the center as Rosenbaum and Huber were. The gas station footage shows Grosskreutz wandering around, smoking a cig, and hitting on chicks in the background while "Shoot me, nigger!" was happening. Ziminski is calming the waters, and Huber is directly behind Rosenbaum, trying to restrain him at one point. The eye-opening thing for me, perhaps because I wasn't paying enough attention earlier, was Jump Kick Man trying to light fires with Rosenbaum.
I think Ziminski is a key here, and Richards called that out today. Why exactly did absolutely no one from the State even try to draw attention to his actions that night? He was telling Rosenbaum to save his energy. He directed Rosenbaum to hide for ambush (thanks FBI!). He fired a round into the air just as Rosenbaum was closing on Rittenhouse. He then casually strolled towards the south side of Car Source #3 with a gun still in his hand while everyone else was scattering like...they'd just heard five gunshots in quick succession nearby.
He was using Rosenbaum (and others) to block roads, set fires, and try to gas-bomb/incinerate police. Anyone seen as being on the side of the police was fair game, and this baby-faced medic all by himself was absolutely a prime target for a beating at least. Free gun, kid gets a little brain damage - win-win.
Here's where he fucked up: he didn't extend the "oh, he's on the side of the police" thought far enough to believe this militia dude may indeed be on the side of the police. After the geese scattered, he went to the place where an anti-cop person would go: the furthest point in the lot away from the police line. He figured he'd have a clear shot there. When Kyle somehow doubled back to check on the person he shot and then started running towards the actual police line? He must have felt like an idiot.
No worries, his wife is there to rally the troops and send them back north after him. People like Jump Kick Man and Huber are the people this message is meant for, and it resonates. It's ironic that the person furthest away from the message's target was Grosskreutz, and he was the first to catch up to Rittenhouse. He was trying to get some sweet, sweet social media money for running after a guy and "interviewing" him on livestream, but quickly switched from neutral to dedicated when overtaken by the mob on their way to Kyle.
I don't think he was thinking of mag-dumping into Kyle when he unholstered. I think he was more in the mind of forcing a surrender. Seeing Kyle flat on his back and firing at two other people changed that shit real quick.
And to think this could have all been avoided had people taken Kyle at his word that he was a friendly.