So here's my issue with it. Including Marchi allowed Marchi's lawyer to question Vic in depo. Ty didn't depo Marchi. He has to run up a bill not just sitting through the time Marchi's lawyer questioned Vic but in filing a response to her TCPA in the hope of her not getting it. If it's granted what good did suing Marchi do? They didn't get any discovery from her whatsoever, they didn't get to crosscheck her answers with Monica's in deposition, it served no purpose but to lose them money, Now, it would be unfortunate if that's what happens, but I don't see how Ty could look at that possible path and say "We need to sue Marchi", knowing they didn't have enough to keep her in the party when TCPA hit presuming her TCPA was at all competent (which was the assumption until Monica and Ron's insanity).
You might be able to argue about whether any of the potential round 2 defendants were feasible in a round one to replace her, but there's nothing at all saying they needed to have 4 for round one anyway. Marchi has been nothing but a waste of time up until this point (presuming a successful TCPA), so there's no way I can believe that her part in the suit has somehow gone 'according to plan', should she escape. Even if all four TCPAs were granted somehow, the other three have contributed much more to Vic's cause than her with their dog and pony shows, their bad TCPA filings, and the little discovery they turned over.