I've had a theory about Tyler for a few years now and after seeing him with Carragher and Neville in the commentary gantry for the recent manyoo Scousers match and, his tone when Matic scored on Wednesday, I really don't think it's a matter of favouritism or bias, I simmply think he tailors his reaction dependant upon whether its the home side or the away side that score. If the away team score and he starts shouting and raising his voice in excitement this could be heard by the surrounding home fans and obviously could land him in hot water as the majority of the stadium is deathly quiet when this happens. Listen to his reaction when Matic scored on Wednesday, he doesn't raise his voice, there no yelps or whoops or screams. He reacted the same way every time QPR scored in the 2012 title winner.
I really do think its got everything to do with this and nothing to do with favouritism. Listen to his commentary for games not involving us to give you some objectivity, hell scream like a banshee if it's the home team and react with sullen monotone if it's the away team.