Disclaimer: I'm caring more about their igling ability not their fragging, but obviously fragging does matter some.
#1: FNS. His midrounding at Masters was an absolute masterclass. He might not be a big fragger, but he's definitely not ALWAYS dead weight, and you can tell he really leads outside of the game as well. Any team that picks him up will do well, and with Optic, he's formed them into one of the best teams in the world.
#2: Redgar. A great fragger, super wholesome dude, and fantastic within M3C's structure (a lot of which he made). One of the few IGLs that can clutch just as well as a star fragger, and his and ENGH's strats set the meta. Ofc with M3C he won Masters 3 last year and was a finalist at Champs. Excited to see more of his team next masters hopefully!
#3: Saadhak. A fantastic kayo player, and undoubtably the greatest IGL in South and Central America (yes ik Loud is a Brazillian team I'm talking geographically). With Loud, he plays and calls incredibly. I wish I knew more about him out of game too, but sadly I don't speak Spanish or Portuguese, so it's harder to find info.
#4: Boaster. I'm gonna get a lot of flack for this one, but even though his individual performances can be lackluster and his strats overcomplicated, he's absolutely the centerpiece of Fnatic both in and out of the game. He's the emotional glue AND he shapes the team along with Mini. Their victory over M3C last qualifier shows the peaks he can reach individually and his team's structure can reach as a whole.
#5: Vanity. In terms of roster building, he makes such a difference. The only igl to lead TWO seperate rosters with different core players to international tournaments (V1 and C9). Once again, he's not the strongest fragger, but he's proven himself able to create a team and get them to compete on the highest level. That's a super rare achievement, and I hope C9 qualifies so we can see more of him.