Oh ya GTR was probably a better complete player than f0rest starting around 2009, but nevertheless f0rest still probably had the highest aim ceiling + had a wonderful career before GTR came in. Also I wouldn't think a team with GTR and NEO would be a very good team (assuming they were both polish/swedish). Super teams tend to fail, thats been very apparent. Sadly the same was true for 'national super teams', like 2009 fnatic. Gux + GTR +f0rest with cArn and dsn supporting (dsn still top tier AWPer at this time as well) sounds like a team you couldn't beat, and yet it stayed as just a consistent top team.
Lots of skill comes with lots of overlap, again think of one of my favorite players trace, he could be the worlds best AWPer (as shown when Sunde was on his trip and they needed to play with a stand-in), this guy has most of the criteria to be a GOAT contender, yet saying he is the GOAT of 1.6 would be silly. Why? He had a pretty trashy team. By the time he was in mTw they had all basically fallen off and he had a much worse situation than NEO, and yet he would regularly outshine him. I think neo should 100% be in the conversation as he is a god-tier player, but I don't think its as much of an open-and-shut case as most people seem to think.