I think Rove and company see a surge to get a non establishment type and are prepping for a brokered convention where they can put “their guy” in. It jibes with why Jeb seems to be acting like hehas the nomination in the bag.
I was just reading yesterday that Rove’s Super Pac is having talks with Walker. Rove doesn’t have a good relationship with Jeb, but apparently the GOPe’s default candidate is Walker.