During the primary the principle goal is to get enough votes for people other than Cornyn to force a run off. Cornyn will never survive a run off, especially after his treachery on the debt ceiling vote.
Being very realistic, there is no guarantee Cornyn would never win in a runoff. That depends on who the runoff contender might be. What would make us think a runoff campaign would be any different that the current Stockman sham?
I may be way wrong, but some fishy aromas are coming from Stockman’s non-campaign. Strawman anyone?