My opinion is that this is just some one starting a rumour based on what happened in last night's episode - Travis getting all narky with Sam.
It's highly unlikely.
And even if it was true, we'll never know. It would be swept under the carpet so fast and Travis would "voluntarily leave" for some reason or another. These things usually aren't revealed. ie. the Justynn thing where we've since learned something dodgy and violent definitely went down, but the producers were so shit scared they wouldn't talk about it at all.
#frozenfeeds