What are your alternatives? Lemon's splits are fine, but he may have room to progress on his pitches and stamina. If you're not going to contend this year or if he won't be a significant upgrade this season, it might be wise to save the 40-man roster spot and keep his arb clock from starting. If he's the piece you need to win a title and you can't fill that spot any other way, punch his ticket and get him up there.