No, it appears that the formula is primarily built on contracts, so someone like Brady is a comp pick no matter what, however on some of the edge cases they bump a guy up if he plays enough snaps. So Roberts, whose contract was minimal, might have gotten bumped up to mattering if he played enough snaps.
That makes sense to me, contract is the primary decider, but if you lose a guy to a low contract, but he plays like 40% of his new team's snaps (Roberts was just under) they take into account that perhaps his low salary wasn't reflective and move him in.