User blog comment:KrispyBaconator/Why Do We Lump Cameron In With Mike and Zoey?/@comment-1396625-20170612165349

It's due to TDAS.

While he still has a personality in TDAS, TDRoTI is what featured most of, if not all of, his development. That season he also had major interactions with Lightning and Jo, and more of one with Scott. That left a lot of people wondering what exactly his purpose was in the next season, which was a season where he barely did anything other than interact with Mike and Zoey.