Suárez played out wide in a 433 a good few times towards the end of this year which outlines his selflessness and mobility and he always drops off into pockets of space anyway. He is more selfish than Benzema but he's got more quality as well, so ultimately he'll provide more for his team as well as producing more individually. Plus he adds a bit of bite, tenacity and workrate to an attack which is short on that.
I'd say it's a complete and utter waste to play someone like Isco so far forward as a "false 9" because it's a waste of a forward position on someone who possesses so little goal threat. How many successful "false nines" are there? It's very fashionable to talk about them but realistically only very special players have made it work. It was first tried out by Hungary back in the 50s and yes part of the reason it bamboozled England and worked so well was because it created space for the "false nine" - Hidegkuti - to work his creative magic, but he wouldn't have been played there to begin with if he didn't possess a goal threat. He had a 1 in 2 goal record at international level. Similarly when Spalletti brought it back into the modern game it was to help maximise Totti's creative influence on the game, but he still possesses a terrific goal threat. Then of course there's Messi. The likes of Gotze and Silva have been tried there as makeshift fixes in international squads because of inferior forwards, but when you possess the means that a club like Madrid have then you'll never be forced to go for any such makeshift fix. As of yet neither of those two (or Fábgreas) have excelled in the role either.