I think IF Polanco and Kirilloff are both going to be back this month (let's say that's the case) then I think Julien will have a hard time getting called up unless/until another major injury happens. Which could be at any point, right?
I do think more and more that Kepler is the one who is going to have to fight to save his job. With Gallo looking solid so far this year, if he and Kirilloff and Larnach are all healthy, I don't know how Kepler gets at bats in front of them.
Once Buxton starts playing more and more in the field, probably starting in May, that will open up more options for a player like Julien.
Keep hitting at St. Paul and force the issue.