Saunders is not really an issue, Phillies needed a LH power bat.
Kendrick is playing just fine, can't blame Mac for putting him into the lineup.
It's a long season, there will be slumps and injuries.
At some point Altherr will get 100 PA in a month, if he tears it up, he'll never leave the lineup.
Same applies to Stassi, who if he has a hot streak could sit Saunders and play LF, or platoon with Joseph.
And Knapp, once he gets comfortable calling games, could push Rupp.
You want guys on your bench who could potentially replace your starters - it's better than a bunch of 0 WAR, AAAA types.
Some guy called Gehrig was pretty cold sitting on the bench at one point in his career.