Between the SF, SG, and PG spots, we have 5 guys in the rotation, that's the right spread. Even if the trade happened, Brewer would be insurance. I can't see DA trading picks for insurance.
Daniels can easily handle playing 25-30 minutes off the bench given his positional flexibility, and House is good for 15. There is 144 minutes at those spots total. That gets you to 100-105 between the starters or an average of 33-35 minutes for those guys. Throw in blow out minutes and you're right where you need to be for MPG (considering Rondo will be playing on the high end for MPG.)
Most likely I'd see Corey eating into House's minutes, if at all. Playing in our offense would likely get him a lot more open looks, so I wouldn't be surprised to see his % go up. The only gap I see in our bench is a big wing for the occasional Melo, Lebron matchup - I don't think Corey is good enough yet to fill that roll.