The only reason why tgrd core played in tier 2 was because they wanted to stick together. All the players got tier 1 offers. They were already the level of a tier one team, but it would be interesting to see how m80 would do in tier 1.
m80 isnt t2 caliber. neither is/was the guard core. the 4th best team, after mxm, was either g2 during split 1, or dsg before roster changes. neither of those teams were anywhere close to t1 in na.