I might be wrong, but how does 4 link solve the problem? We havent even really identified the problem!
OK, assume whatever axle he has, it ended up all the way in the front- looks like the grabbed the rear of the axle, and pulled it forward. Its possible, in a way, that yes, under massive power, it somehow tried to lift up (kinda like an anti squat), but exactly how much power do you need to do that?
If the frame already had some damage, and already had a weak spot, yes, it could certainly bend up like that. a 4 link would help, but it only moves that particular force forward, and onto part of the frame (again). So.. then what? He still has to address the inherent weakness that was apparent in the frame... although if he's doing a 4 link, he's probably beefing up the attachment area, which is probably the solution to the problem.