... I don't want to see any claims of gathering all the bijuu either.
This default stuff is not the same accomplishment as winning them at all.
Considering that not even Zenaku "won" them all in the sense that he fought every single other jinch and beat them in a battle (I know of at least one tailed beast that was just plain handed to him) I am pretty sure there will be warm fuzzies however way the beasts are all rounded up at this point. By default is still a win in my book.
As far as I know Zenaku fought Mioku for the 7 tails back before he had the 9 tails and that's it.
You wanna know how many zone fights Zenaku did when he went out to gather all the bijuu? I'l give you a hint, it's a single digit number that rhymes with "Hero".
Here are the bijuu fights I've done:
Bocchiere defeats Athos for the 6 tails
Bocchiere defeats Luka for the 2 tails (which is also given to Kumo, that's how they got that one)
Bocchiere successfully defends the 6 tails multiple times before losing to Shinro
Bocchiere defeats Kamui for the 6 tails
Rakudo defeats Hazama for the 8 tails
Rakudo defeats Kage for the 6 tails
Rakudo defeats Kamui for the 2 tails
Madara defeats Nathan for the 4 tails
Bocchiere defeats Trev for the 4 tails
Those are all fights where I killed my opponent and won, and 99% of them (<3UTrev) contained my opponent complaining for weeks on end about everything I did, getting the important decisions against them, and then losing.