Colt Keith is just a guy. He's not awful, he's not good. He would be the worst starting 1st baseman in the league...low power numbers, mediocre average, and terrible glove.
And there is no way they are going to be moving Mcgonigle around to different positions. Playing in the majors is tough enough without getting moved back and forth from short to 3rd. It would seem that Javy will be at short and McGonigle at 3rd.
Meadows has about 30 games left as a Tiger and then he'll be in Toledo and then an ex Tiger