I am not a musky fisherman, but I feel if your buddy added a larger swim bait, like the Berkley hollow belly swim bait, the ripple shad, flat back shad or large Yum money minnow would add a bit extra thump and flash just behind your jigs skirt which I feel would be beneficial.
I know that would work for pike, and both fish species respond well to alot of vibration and flash from lures.
WW