In Season 3, he has that as his established record against the two. He would have likely lost his fight against Psyqualia Aichi had the fight continued, given the amount of shield Aichi had left, and his attempt to defeat Ren ended with his 'final evolution' being crushed by Phantom Blaster Overlord. He never actually beat Aichi or Ren in Season 1 except in flashbacks. Kai's turn to evil in Season 3 makes more sense when you look at his record in Season 1.This is also the reason he keeps trying new decks through the season: he knows Royal Paladins are a bad fit, and is subconsciously looking for his actual deck. Basically, during season 2 Ren had the flu and could not fight at his best, but once he had his Shadow Paladins back he also went back to be beyond Kai's reach.

However, Ren used Shadow Paladins, which had a different fighting style, and were only released at the end of the season. This is because in season 2 Ren, just like Aichi, is using a Gold Paladin decks which, as above, works very much like Royal Paladins. In season 2, Ren is stated to often lose to Kai despite using psyqualia, and doesn't even try to fight Leon, yet in season 3 he is one of the people Kai looks up to as someone he is failing to catch up with.

Cardfight vanguard pale moon eveolved