The Pacifica treaty was in fact carried over from the TSH/GAT-ITEC/RLMMO merger, and no-one from the leadership of those three alliances objected to carrying it over.
The One Vision pact was (by the time it was signed) superfluous to existing arrangements. By that time, we had held MDoAP+ treaties will all signatories in One Vision, so membership was accepted on the basis that it merely a strengthened our bonds with the other signatories.
Just sayin'.