If you're going with what BB said, then you don't have to deal with that and can leave it as a skill. 

[quote=GreenGoat]
Also, I beg to differ on that last part.EDIT: Im sure some servants have more than one NP. IIRC, Saber in Fate/Stay has 4 or 3.
[/quote]

BC's a personal skill, it's a misconception made by Extra that's not actually true. I'd pull up Vlad's stat sheet to show you but I'm on my phone.

EDIT: here

[img=http://imageshack.us/a/img546/6084/pqk1.jpg]

And yeah, you can have more than one NP. Altria has three counting Avalon. I'm just saying that three ought to be the absolute max for 99% of heroes.