As the Rams move into the heavy-lifting phase of their offseason program, they are essentially set on their starting lineup. But that doesn’t mean some big-time jobs and roles aren’t up for grabs. Rams rookie quarterback Ty Simpson has a chance to be QB2. Nelson Chenault-Imagn Images Here are three battles to keep an eye on during OTAs and minicamp: TE3 Going into the NFL draft, an argument could have been made for the Rams having the deepest tight end room in the league, led by Tyler Higbee, Terrance Ferguson, Colby Parkinson and Davis Allen. But that didn’t stop them from investing a second-round pick in Ohio State’s Max Klare . And don’t think for a second they did so with the idea of stashing him for one season or only using him as an injury replacement. Klare is going to play this year. He’s too good not to. The only question is, whose playing time suffers as a result?…