It is pretty useless to speculate about powers with characters who have histories that span multiple different writers. Different writers will interpret the character's powers differently, so they change all the time. One day someone with Wolverine's healing factor can survive everything but his brain getting destroyed and in the next issue with a different writer he could die if his heart were destroyed or something like that. That isn't a real example, but it is the general idea. Superman has had many amazing powers that have been brought in by one writer only to be considered overpowered by the next writer and retconned out.