They both had a better supporting cast with their previous teams, it’s that simple. Bond is a shutdown guard, period. If we could afford to start an American at that position, he’d still be in Winnipeg.
If they spread out to defend Streveler, Harris has openings up the middle. Then you have Hardrick, Bryant and Co. blowing things up on every running play.
If you're the opposing D, of course you will game plan to stop the run - but that doesn't mean it's going to work.