I have been watching moose for a while in tier 2 and he was actually insane in every department, but ever since c9 he looks much worse mechanically and decision making wise
it's not really about whether his level of play has deteriorated or not but it's just everyone who got a shot in tier 1 let's say are all some of the best players in their region. Also, the level of support staff e.g. coach. assistant coach & analysts is higher than t2 so the level of play like strats etc is much higher so makes competition stiffer in tier1, imo tier1 in America's region is the hardest region to play and qualify in.