Interesting that many people don't understand that RR's involvement is not just some nice bonus, it's an actual valuable part of the bid. Just by putting his name on it, his group can make their offer $100 Million (spitballing here) smaller than others and still be accepted. And they will take full advantage of that, because business.
Obviously it has a huge value for NHL but very small value for the sisters, but in the end, it's NHL who will make the final decision, and Melnyks will miss out on a good chunk of cash thanks to Deadpool.
In a general sense the commissioner represents the owners. I can't see Bettman and the NHL pressuring the Melnyk sisters into giving up over $100 million on the sale of their team.
There would be lawsuits. It would split other owners who would now be wondering "could the NHL force me to sell and then force me to take a lower bid?". It seems like a terrible idea all around even if they want that bid to win.