I'm beginning to doubt his alleged IQ of 150.
Unless he has hyper specialized it into the written end of forensics; or he has concentrated on formalized debates rather than ripostes or knife fighting (for which he has Stabby the Clown anyway, eh?)
I doubt it's 135 even ... I'd give him 127. There is no creativity. It's not about the number of facts or memory. If he does have an audiographic memoyy (that is an adjective - not a fixed things where you remember everything) that's NOT a good thing, because it means he's faking intelligence - substituting memorization for actual thinking. above 115 it's how you can manipulate symbols in your head ... that's how you create things.
Cruz has no quick wit, at last none that I've seen. If it were a strength of his, we'd have seen it, they would have showcased it.
The thing is, I hate to say it, Rubio was actually showing a little intelligence battling Trump ... but there you have the problem that without strong character, intelligence is either wasted or used for negativity.
I'm content to be relatively dumb and ineffective :-) If everyone were dumb and ineffective, the world would have few problems.