However, I'm not 100% convinced.
Since when is this not a good proof? How about removing post and archiving thread later, like it will delete previously archived post and no one will notice or how about this:
Like I said;
The timing of the evidence in this particular case does seem to point to the two accounts being alts, though.
I just don't think it's enough to make me
100% certain that they are alts. I'll also admit that I think this situation should be handled delicately due recent allegations of racism and bashing of certain ethnic groups. Right or wrong, founded or unfounded, there are many in the Turkish local who seem to think this is West vs. Middle East thing. I know that it's not, being of Middle Eastern decent myself, but that's not up to me alone to decide. The disenfranchisement of an entire ethnic group is at stake, and I think it's worth taking a unbiased and careful look into the situation.
If otto_diesel claims it's not his alt (I don't know if he has or not) it's worth giving him the benefit of the doubt until further evidence can be exposed. The other accounts you've pointed to that have been banned, and clearly evading bans does add circumstantial evidence. But it's only circumstantial. The fact that there's a lot of alt-abuse in the Turkish local doesn't mean that every one there is abusing alts. And the Turkish local isn't the only place where alts are abused and bans are evaded.
Again, maybe I'm being overly sensitive about this specific situation, but that may not be a bad way of approaching it, in light of recent events.