He would have been the Senate version of Justine Amash the principled conservative who votes with Nancy Pelosi most of the time ... and just claims to be doing it for a different reason.
Your suspicions have no basis in reality. If he were to be a leftist flake or loon like Amash, that would’ve been reflected in his prior judicial service. He would’ve been an excellent, pro-Constitutional and anti-establishment Conservative Senator. The only pain he would’ve been was to corrupt RINOs, and we need as many “pains” as possible.