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Caali files are an incomplete emulator which use the official client. If you hate "offi crap", then why not make your own emulator? However, even then, you'll still be using an official client, which apparently you hate.
Using Caali files without a LOT of reverse engineering will never make a playable server(a Flyff server needs around 100+ CCU to be considered "playable" due to the need for economy, pvp, and community). Caali files will never be able to hold 100 players without a lot of reverse engineering. Not to mention there are a huge amount of security flaws in Caali files, which is why I don't expect this server to last very long(any idiot can spam you with random packets and lag/crash your server easily).
If you want to make an emulator for v11 or whatever, that is respectable. A fully rewritten source code could be useful and effective for production, but would be very costly in time and effort and I do not recommend this for most servers.
What you're doing is using incomplete files(when complete files are available, with source code access) to host a server that will lead to only disappointment from your players. There is NO reason to use Caali files over server files with source access.
Overall, you're living in the past as many Flyff players seem to be. Caali servers may have been fun for you, but there is no room to improve upon them. I'm sure we all can agree Flyff is not(and never has been) a perfect game in many ways and has a lot of room for improvement. Look at the flying for example, it's incredibly boring when it could be very fun with some modifications.
just let him do what he want... you got your succesfuly server and it's okay. If he want to do a Calli Server let him do I don't understand why you want to influence him.
But at the end your are right but it's his decision...