Well Blount+Assault Missile is great for combating swarms flying in formation, but the predicament facing Imperial players is that ~60 of their squad points will be tied up in two ships, and at least one of these (Phantom) will almost certainly be out of formation. Cracken is the way to go with that list.
I agree that Blount + Assault is certainly not the best way to go in this particular match. However, I think there's still a case to be made for Blount over Craken. And that case is Ion Pulse Missiles. Now, it doesn't matter if you roll all blanks and your opponent rolls all evades, you still do a damage and give 2 ion tokens. Further, since Ion Pulse Missiles don't require the use of your TL and you don't care if you hit, you get to keep it for next round where you can follow up with a focus and a range 1 shot. Not bad.
As for Craken, you MUST put cluster missiles on him. Then he gets two attacks during a turn and is able to hand out two actions that round. That's not a bad thing at all.
My main complaint with putting cluster missiles on Blount is that you're paying 4 points to basically hand 2 actions away one time. Knowing that you're facing a Defender and a Phantom, the best case scenario would be against 2 unfocused dice, where you'd be looking at 1.76 damage. The more likely scenario is that they're spent against the Defender, yielding 1.34 damage. For 2 points, you could equip him with SL instead, and continuously give out 2 actions (one at R1-2 even!) and then only do .51 / .35 damage.
So it comes down to being +2 points, +1.12 dmg (averaged from 2+3agi non focused) +1 one time use action during combat @ R1, -1 repeatable action at PS8 @ R2, <PS7 eligible for the second action
I personally think SL will end up being better simply because you're unlikely to have multiple actions/ships you want to hand actions to that are PS8+... furthermore, it makes him a more "dangerous" target for your opponent ... It's unlikely that they'll kill him before he gets his cluster missiles off, and then he's just a free action and a 2 dice attack... but with SL, he's 2 free actions and a 2 dice attack... so he might draw their hate earlier in the game, leaving someone better around to close the game out.
*shrug... we're talking about ships that aren't even released yet that no one has actually flown... along with ignoring the tactician and decoy upgrade cards that will be available at that time that we have no clue what they do... Heck Decoy might be something like Biggs' ability, which completely changes everything.