Oh, I love that idea! That episode 1 is the first time that TY and MSF are actually alone, hence the sudden escalation! I would honestly love to see a pre-canon fic leading up to their first confrontation. You've thought about this alot!

And it's canon that Jack joined Xin Tian Meng a year ago from the start of the series. If I recall correctly, it's mentioned offhand by Ah-De, in some protest about Jack still being new?