Since Cruz is trying to get the nomination he is allowed to take support where he can find it. He will not bend to GOPe will but he is free to use them.
And I am free to say I have lost a lot of respect for Cruz now that he is willing to get in bed with the GOPe to try for a brokered convention where the odds are very high they will stab Cruz in the back and rig the convention to install Ryan as the nominee. Because there is no realistic way Cruz can win a majority of delegates at this point.