To be fair it wasn't 3 months at all -- maybe 1.5. It was pretty much after playing PL in ESL In Week 5 or whatever it was that he committed to grind out the MU.Wait, "you're not sure why I feel" that someone losing to a character for 3 months would be at risk if they come up against one of the best representatives of said character?
But yeah, that's how he always works. Once he loses to something a couple of times and knows he'll have to play it again, he goes ham, grinds the MU endlessly, figures out all the options, plays a ton of online sets, and then he actually feels comfortable and starts actually liking to play it. Remember Bane
With Pig I'd always bet on what he's most prepared for at the time -- and it's usually something he's lost to in the past.