Hackett does not exist... He is an long-range aka of DHK (probably HL, Barth, Arma - high ranked or/and loyal DHK) as many other "experts players" before from DHK, X2X, G$F etc.
Btw timeline sucks, XXoDDuSS didn't played in july 02 and didn't went inactive in 03 and there were much players who had similar gameplay as he (don't mention me strategies/tricks, I'm talking about playing) and other you've named, so it's totally crap to put him and other u've named as successors (probably except you and barth, since SHC pro gaming is kinda founded in 04/05, when people started to use all strategies/tricks etc. in-game). Idk who told you even played back then, you have bad informations hl.. You should know about real pioneers of SH/C and put them along those.
Anyway that Dexter above my reply, surely isn't real Dexter from GSA, it's just hl/bar or whoever as usual.