I'm advocating the B splash too. Earwig Squad is indeed insane and I think he's got MD potential. I mean: even IF you can#t rip something meaningful he will at least be a freaking 5/3 body for 1B or 2B in 99% of the cases. We should not forget that you technically CAN put him into play via Lackey/Winstigator, although it's not optimal.
Second reason for B splash would be Cabal Therapy. This card is so freaking powerful. However given the decks we have to beat right now I think that Cabal Therapy will only be comin in against combo (Storm and S&T) and maybe SFM.dec.
Third:
Perish is such a good SB choice right now. I know I'm repeating myself, but just take a look at the popular creatures. DRS, Goyf, Scavooze, Mongoose...Elves. Also I think that Sudden Demise is strictly worse than Perish (and Pyrokinesis). What I like about Perish is that it doesn't make compromises. Cast it, resolve it, go to attack phase. I don't want to find myself in such awkward situations where you cast it for 3R just to kill DRS, and probably a small Ooze ...and Tarmogoyfs survives. You should realive that you never actually get to kill Tarmogoyf with it (and probably neither 3/3 Mongoose or Scavenging Ooze). It's certainly good against ELves and some other random non-green aggro deck, but I don't think that this superior to Pyrokinesis in those MU, because, you know Pyrokinesis costs 0 mana. And is an instant.