Too much starting pitching is never a bad problem. It is, in fact, not a problem at all. Very, very few teams make it through a full season using as few as six starters, so having more on hand the nominal five man rotation is probably a good idea.
That said, there are starters and there are starters. The waiver wire often bulges with guys who can stand in as starters, while young pitchers with upside and team control remaining offer any team a great deal of value on the trade market in the rare case of an organization with an extra guy like that just lying around.
The Detroit Tigers are just such a team to have extra starters. They have their homegrown ace in Justin Verlander, then two number two starters acquired via trades (Doug Fister and Max Scherzer), and finally the free agent splash Anibal Sanchez. After that very impressive top four, the Tigers have some options.
Drew Smyly and Rick Porcello are both young and cheap and not bad at all. Either player stands to net a tidy return should they be offered up in a trade. The Tigers don’t have to trade either player but Detroit doesn’t appear married to the idea of Jhonny Peralta as their shortstop, either. According to “reports”, Porcello might be the piece the Tigers dangle to upgrade at that position.