Rule 5 pick Michael Martinez is about as useless as a player can be at the MLB level. His main value lies in his versatility and speed. The 28 year old has only played 33 games above Double-A in 5 minor league seasons, and owns a .263/.683 minor league line. Showing no power or on base skills. Just the ability to play multiple positions. While Martinez continues to soak up a big league paycheck and at bats, Kevin Frandsen rots away at Lehigh Valley. Let's compare the two...
Frandsen - 28
Martinez - 28
Frandsen - .243/.636, 65 R, 29 2B, 1 3B, 7 HR, 53 RBI, 6 SB in 228 games
Martinez - .158/.396, 1 R, 1 RBI in 16 games
Minor League Stats:
Frandsen - .311/.821, 293 R, 111 2B, 12 3B, 31 HR, 216 RBI, 44 SB in 436 games
Martinez - .263/.683, 272 R, 95 2B, 26 3B, 20 HR, 208 RBI, 82 SB in 549 games
Frandsen - 2nd, SS, 3rd, 1B, OF
Martinez - 2nd, SS, 3rd, OF
As you can see by the statistical evidence, at both the minor and MLB levels, Fransden is every bit as versatile as Martinez and is the superior offensive player. Upside should not be an argument for keeping Martinez, because Frandsen is only a few months older and has outperformed him in every area aside from stolen bases. Martinez is a switch hitter, but he can't hit from either side of the plate, so who gives a shit. With the Phillies struggling to score runs, every at bat matters, and if you're going to give somebody a spot start or use them as a pinch hitter, then you should be using the one that actually has a chance at doing something good.
Of course, there's always Domonic Brown (11 G, .390/1.200, 11 R, 4 HR, 9 RBI in the minors), but he only plays outfield and is an actual threat at the plate. So, that makes too much sense.