XLG dropped their IGL in Kr1stal because of region restrictions
Boom shouldn't be here, but proof that when the roster isn't poached, they can show up, they just choked in playoffs.
G2 similar to Boom, they kept four of their roster the same and then made a change to pick up Leaf. Proof that when the roster isn't poached, they can do well.
I assume you mean DRG, again proof when you don't poach the roster, they can show up.
All the rosters you just listed prove my point of when they don't get poached or lose their best players, they can perform and contend. Boom went undefeated in Stage 1, G2 was the best team in all of valorant for a bit, DRG made Shanghai, XLG made Toronto.
Obviously there are outliers for both sides, Gentlemates, Nongshim, for example didn't make a whole bunch of changes their first year and got railed.
But the main point stands, we don't get to see some of the full potential of these winning rosters because they get poached, can't play cause of age, region restrictions, etc.