It's great to see Oscar saying that he wants to take on the best, but I don't see this happening. Odds are that Mayweather will win the fight in May. At that point, the fight that everyone should be clamoring to see is Mayweather-Winky.
Winky moved up to 160 strictly for financial reasons, it wasn't anything physical, so he should have no problems getting back down to 154.
Also, Winky was never a big puncher, so Mayweather shouldn't have any worries about facing a naturally bigger man. That would be the true PFP championship and a fight that I would love to see.