Lipka has had a nice spring. But he has yet to play above A ball. He is not on the 40 man roster. He did not have a very good season in A ball last year. I think all those things will override his spring performance. Impressive as that is, there are the usual issues with giving too much weight to spring statistics, not least of which is sample size. All of 22 spring training AB's for Lipka so far.
Spring training performance does come into play when there isn't much to choose from among players. Here I'm thinking of the foursome of Terdoslavich, Cunningham, Pastornicky and Constanza who are competing for the last bench spot. Even within this group, everything is not quite equal. But close enough so that spring performance could tilt things one way or another. Constanza is having the best spring of this group.
I don't put La Stella in this group because to me he is a contender for a starting job. To me you either want him starting or playing in AAA, unless you are going to play him a fair number of games even with Uggla starting. Also he isn't on the 40-man roster. And I think service time considerations are a factor with him, though not a major one.