Only 10 of the 99 delegates in FL are awarded to the winner of the state. 81 of the 99 delegates in FL are winner take all by CD, 3 per CD. Rubio could win in the Cuban-dominated south FL CDs and have a healthy block of delegates even if he loses the state as a whole. Not only could he win the Cuban majority CDs, but other south FL CDs held by Dems have a large Cuban population registered as Pubs. They too are each worth 3 delegates.
Rubio won't even be in the race when Florida votes! This is of no concern. I'd rather he be only in concentrated areas. Gives Trump the vast majority.
Also, re: GE - it's pretty clear the anti-Rubio Cubans won't be following him to the GE while the pro-Rubio Cubans will follow Trump (according to FAU poll)