I've really enjoyed updating it as well :D
Are you playing on the download version? Theres a new update out 2 days ago. (synergies not appearing was a bug that was fixed, and Chip has entered the normal pool officially and will appear the same rate as everyone else now).
Edit hold up, Chip's spawn rate might only be normal in the Egg event but not the team select at the start, I'll need to investigate quick.
Double Edit: YOURE RIGHT HE WAS STILL EXLUDED FROM THE STARTING POOL OOPS, he was only added into eggs and the sense at the normal rate, putting out update right now