s.MP is actually very practical vs shotos, they actually use it all the time on eachother for stopping dashes and what not. c.MK indeed does go under it, but if whiffed your opponent gets a free dash in or even a jump in and since you’re a shoto, eating j.HK,c.MK,LPsrk,karaLPsrk crouching really hurts. With s.MP you simply don’t have this problem. c.MP could be used the same way as s.MP, but then you’re crouching and risk eating extra damage when the attack fails.
Srubmaster K: if you’re on a stick this will be pretty easy, you can enter the whole motion after hitconfirming the s.MP and get the super out. It’s important with any link that you drum it when possible. From here on it’s all about practice really, I’ve spent like 5 hours myself on just that link but now that I know how to do it, I can spew it out in the most unexpected moments:)