I have been working the 2on1 for a year now, thanks mginaction!
So much game from there, it sets an offensive tone from the start, you're always a head a move, the hand fighting is huge, the grip battle
From the 2on1 you can set up so much stuff, back take (favorite) hook sweep, collar and elbow off the grip break to both sides, double unders, 1leg X entry, X guard, ankle pick, knee slide push sweep, guillotine, etc....