Your spot on..
Trump made fun of him during the debates so from that point on many here despise Cruz hence the CDS which comes from a lack of self thought.
President Trump mended fences with Cruz - but some cultists want to be more Trump than Trump.
Not so quick, a guy who scores either perfect or near perfect on the American Conservative Union ratings may not be pure enough. May have drop of non-conservative blood in him from an Uncle from 7 generations back.