besides what general tekno said above,there's nothing to be confused about.
the idw sentinel is a completely different person in a completely different tf muliverse than the garbage that bayverse spewed out.
micheal bay essentially said "f@ck it,i'm doing my movie.... my way"....
lolz,to add even more confusion,that "autobot" that orion pax is talking to is actually decepticon shockwave before the "empurata" treatment......
(even though he looks like he could be ultra magnus's younger twin)