We dont know how strong current Lucci is. But i agree that he is definitely stronger than EL. But Franky is also far stronger than EL, so i believe current Franky is at least on par or if not stronger than EL Lucci. Its a matter of who grows faster. And yea never say never.
Luffy and Zoro are probably far above Lucci and Kaku at this point, even if they became stronger themselves.
With the comment about CP0 and SWORD being rivals, i think it's more likely that the marines we saw will clash with them at some point.