He's clearly outmatched.
Which makes me think, as crazy as this can sound, that we should start Hollins and slide KG to PF for tonight.
It is not an upgrade but at least it would bother Horford and Smith a little bit on both ends of the court since they'll be giving up 2 - 3 inches.
Put Bass on the bench, playing the same amount of minutes so most of his playing time is against Ivan Johnson and/or Jason Collins, both of them he can outplay. All the while, Hollins should set the tone early and crash the boards or if not, make it hard for Al Horford to get some.