One tweak for the 4* Wolverine that would make him a lot more valuable – he’s always heals to full health outside of battle. If downed, he’s automatically revived. In a tourney, if someone hurts my team before they are taken out, and they revive to try again, Wolverine will be back to full strength.
No, IM40 heals at 1 health per 5 seconds. Do not confuse time recovering from being downed (which is absurdly short for IM40) with time recovering health. They’re entirely independent.
And there have been several threads asking what the logic is behind time recovering from being downed without any answer other than player observations.