It wasn't his debut, you do realise that don't you. He's played half a dozen games, and has looked accomplished and comfortable in them all.
Just as no one wanted to lose Keane, not many were upset because we knew we had a good un in Tarks to step up. In the same way no one wants to lose Tarks, but I have no doubt that Collins can fill his boots, and at his age that's some going.
We need our best players on the pitch, and the younger, the quicker, the better. Collins fits the bill, and while I wouldn't drop Tarks for him, he deserves to be on the pitch, and we need him on the pitch. Roberts couldn't buy a game, yet has taken to it like a duck to water, imo so will Collins.
All the crap about playing a CB in midfield is ********, because I have never suggested he play in midfield. He'd do a specific job, in specific matches, where the need to occupy that hole between midfield and the back 4 is imperative.