Sanji and Kizaru kicking?
Regardless or Ben Beckmann and Marco fighting Kizaru being considered as foreshadowing as to why Zoro will fight him: he needs to fight a proper swordsman and not just a guy who can make a sword out of light. He's not even that skilled with it.
Kizaru is commonly regarded as the weakest of the 3 original admirals
weakest vs weakest = Sanji vs Borsalino
You really think that's a better reasoning than:
-Roger's 1st mate fought with Kizaru
-Shank's 1st mate stopped Kizaru
-WB's 1st mate fought with Kizaru
It's pretty obvious that Luffy's 1st mate (Zoro) will fight Kizaru.
He's not that skilled with it? How can you make that claim lol he was fighting with Rayleigh who is safe to assume was prob. one of the best during his prime. You can say the same thing about Fujitora, we never seen attack with his sword. He just pulled a meteor using his sword, we never seen him fight physically with the sword.