Yar, I dunno about this. Perhaps the Raider could have access to both OD-types (but less powerful versions of each), this would make the Raider more versatile, but probably not as effective as a dedicated Sent HoF (with its increased health and powerful Burst OD), nor as effective as a Outrider chaser (with its increased speed and access to a more powerful stream OD). Basically, it would make the Raider even more of a 'Jack of all trades, Master of none' armour-type.
And I agree with Disci on iOD, it's really unbalanced on certain maps, I don't really want to call for a nerf on it, but perhaps a change in its mechanic or assets/weapons that would address the agility/speed of Sentinels on smaller maps.