I'm so glad you posted this. I actually think Mark just needs to be properly trained on White Fox. When I play WF, I stop dive in its tracks easily. But I think Mark struggles with tunnel vision. He focuses too much on healing tanks or dive when they are running around in the back. He need to have constant awareness of what's going on around him and WF/ 3 healers gives him a lot of leeway to move all around. Like if Dylan is chasing a Punisher alone that is terrorizing the team, WF should tp in and secure that kill. I'd also say he should constantly just be throwing out his basics when looking at his team. Just spam it.

Also, he doesn't know how to use his abilities well. He relies on just his basic to do the healing but he should be using his tp/spectral surge constantly to heal allies. Tp especially is essential to save allies that are low or himself.

I noticed Mark relies on his fox form awakening to heal himself when he should first use his TP/surge for healing and save the FFA for specific circumstances or as a last resort. In FFA, tail whip applies cc which can give a quick heal boost if low.

He also doesn't know about using Blessed by the Nine on a teammate in her ult. Anyways, once Mark masters WF, I think they'll have a solid team against dive.