that's the whole point they haven't been practicing together enough
He's the IGL so he's kind of taking the hint. It's not a good look if a team as a whole doesn't want to practice for more than 1 hour a day. I'll admit, Shaz is just the easiest on to shit on right now. But it's obvious the whole team either doesn't care, or is just straight up exhausted. One scrim a day won't win you a tournament.
Adding a coach to a roster should visibly differentiate a team I feel, they should be using more set plays and lineups, better retakes and strategies that the coach provides. Although rawkus just came on recently after his contract issues I don't really see sentinels improving. The only thing that I feel rawkus does is take a pause and tell them to calm down and don't blame each other. Who really knows though because no one except the players know what actually happening.
It is going to take time for a coach to implement things. Take a look at chet for example. He joined optic and optic did okay at worlds and everyone hated on chet for being a bad coach and shit. Then optic won masters and chet is all of a sudden a good coach. So its been less than a month since rawkus got resigned and they got a new 5th. They need to work out agent comps and a lot of other things since the meta keeps shifting, but once they get everything fixed, they could expand upon and get more team synergy and actually start winning shit.