how do you rate an igl

i see a lot of posts that say fns, saadhak, ange1, and boaster are the best igls itw. how do you know? you listening to them?

yea

Wins. Thus you can conclude that every na igl is bad. And every igl in general

yeah me and boaster are chill like that

Reads of course, that's why Optic was so good because they never fell for a fake rotate

when fns comms to me in my games (i'm radiant btw and we duo all the time), he has amazing insight into what our team should do to secure the victory

me personally I rate them based off of their political views, their crosshair color, and if I like their voices when I watch their team's voice comms videos

Team results and domination through maps. Although we can't really hear their calls, you can predict what they said on certain situations.
Teams that had FNS, for example, always looked like a threat even when they were underdogs (when they were Envy for example), and his teams always adapt really well through a map. This could be also something the coach helps with, but most of the times it's due to good IGLing.

i know them all personally yeah

Win rate

Scream -10/10
Fns - 2/10

I call Jon(FNS but I call him Jon(for Pujan) because we close like that) every day.

how good their defensive and offensive reads are, how good their team looks, and how good their midrounding is.

Can't really tell from stats, you need to actually watch the games and see how a team responds to fakes or how they approach sites on attack

If your aim is abysmal and your teammates aren't really all that cracked, the the fact that your team can win a masters means your calls are on point.

Process of elimination, really.

a top player can tell from their mid rounding since that is the igl's calls

Us VLR shitters can't really know, people normally just listen to who they watch,
like sliggy could make a narrative about any team by just saying it and people will copy

steel clears all

frags

If they have negative K/D, they are good

usually a simple but decent way to tell is how many rounds a team wins based on what site they hit or their util rather than winning raw aim duels since it's relatviely hard to tell what an IGL calls midround

if an IGL has strong midrounding can see a comp they have never played before and understand their strengths and weaknesses and build a basic game plan on the spot, they're a good IGL

Something all 4 IGL's you mentioned can do and I would also say stax is in the top tier IGL category