Sounds like a reasonable analysis. I remember people thinking that the rule would stop Trump - but I also remembered in the past that many proportional states are still top-heavy (like SC). So, I didn’t see a problem for Trump.
Obviously they didn’t have Trump in mind when they set the rules for this year - but they did worry about Cruz or someone like him ‘causing trouble’ as they see it - oh well, as they say: Even the best laid plans...
Just another example of how big, centralized plans can have unintended consequences.