Williams was an excellent boxer with one of the best jabs I have seen. He could not handle power but could box very well. I am not sure Roland had the kind of power that could take Carl out of his stride so probably slightly favor Williams. Roland was not an easy target and had some good movement smart, and moxy (heart)so may not be an exciting fight or may have some decent exchanges. Larry Holmes IMO lost to Carl I pick LaStarza to beat Biggs UD
My guess is that LaStarza would lose to Williams, but beat Biggs! There is a bit of a gap in class between Williams and Biggs, and LaStarza might well fall into that gap.