They haven't diversified the shareholding of MWSE at all. It's still the Penns company and the FC. What they have diversified is the shareholding of the Penn company, but I assume it is already more than 3 shareholders given it is a family company.This new setup has virtually zero effect on the way the manly board is currently run.
I think you are right in that they are unlikely to invest $5mil without working hard to see it succeed, but realistically they don't have any real voting rights as such. By definition they do what the Penn holding company says to do, as that is what they are a minority shareholder of.
Personally I don't have a problem with them buying in, and as already widely expressed hopefully they will bring some good skills and contacts to the mix. Should be a good move with any luck. Like Mark I guess my cynicism relates to the way that this is reported more than anything.