During the past season, we went through long stretches with just one lefty in the pen and no real lefty pinch hitter. In a rebuilding season, these small things don't matter much. But if we want to be competitive or semi-competitive in 2017, the front office will have to pay a bit more attention to these details.
Let's start with pitching. When it comes to starting pitching, I don't see much need for a particular mix of lefties and righties. If you make the post-season, it might come into play if you face teams whose lineups are stacked in a particular direction. But during the regular season it is usually a wash. There is a case, however, for making sure the pen complements the starters. If you have mostly right-handed starters, there is a stronger case for a third lefty in the pen.
As things currently stand, it appears likely we will have four or five right handed starters. Our bullpen candidates also lean strongly righty with Viz, Johnson, Cabrera, Simmons, Winkler, Ramirez and Withrow in the mix. On the lefty side there is Krol and Paco Rodriguez. Minty Hippo was very good in AA last year and could be a lefty option as well, though it makes sense to give him some time in AAA. I'm ok with starting the season with five righties and Krol and Rodriguez in the pen. But I think there will be a need for another lefty bullpen arm at some point in the season.
Moving on to the lineup, I think we have fairly good balance--three lefty hitters (Inciarte, Freeman, Muk), three righties (Kemp, Garcia, Swanson), one platoon (catcher) and one switch hitter (I'm assuming Albies will be our second baseman for most of the season even if he starts the year in AAA).
Moving on to the bench, I think there is a clear need for a couple decent bats who can be our primary pinch hitters from the left and right side. We could do a lot worse than bringing back old friends Kelly Johnson and Jeff Francoeur. KJ has the added virtue of positional versatility and providing insurance at our position of greatest weakness and uncertainty (third base). And Francoeur would allow us to rest Muk now and then against tough lefties. The remaining bench players would be Jace and Mallex. Jace might be our opening day second baseman but I don't see that continuing all season. I think his ideal role is super utility player.