It’s very early to be speculating, but with that being said, there are superficially a few signs and symptoms that Connor Betts was an INCEL and/or identified with the INCEL cause.
Below left is a screengrab from his Twitter feed. As can be seen on the right, the “normie” term is associated with INCEL jargon and subculture, although it should be emphasized it’s not only associated with the INCEL groupology.
A cursory glance at Betts’ social media seems to confirm a sad sack single dude who is only with a girl when his mother photographs him with his sister.
Although the INCEL aspect may be part of Betts’ social psychology, perhaps even a significant part, he also demonstrated group affiliations with socialists, atheists, satanists and some Democratic Party politicians.
His Twitter feed [which has recently been scrubbed] overall is so all over the place as to be virtually incoherent. The TCRS assessment at this point is that the INCEL aspect is a significant part of the pathopsychology. The nature of the shooting, specifically the location [the outside of a bar on Dayton, Ohio, early Sunday morning] and the targeting of his own younger sister and her boyfriend, also fits the profile.