Character trophy glitch?

[Jaxical]

So I only just started playing this game... I just met Knuckles and got his character trophy, then I decide to quit the game as I'm wanting to go to bed. I decide I'll check the character select screen first though to see how much percent Sonics story was on. I get into character select screen, spin the wheel of characters and PING! Big's character trophy unlocked and I can now play as him. Despite not meeting him... (I did see him standing around outside station square and went over to talk to him before the Knuckles bit, but he just said one line of diologue and I left him) I take it this isn't meant to happen and is a weird character unlock glitch? Which I assume also unlocks the trophy? Anyone heard anything about this?

[Skyprisoner]

I got Big by defeating Chaos 6. I think.

I don't think we unlock Big by talking to him when we find him randomly, but I don't know.