Pre-season. Of course during the H&A season Blicavs (as with every young player) will be one of a number of guys fighting for the last few spots in our best 22, and so everything is up to form, injuries, etc. elsewhere in the team.
The NAB Cup will merely give us a guide to the strengths/weaknesses of players such as him and where they best fit in a tactical sense. In that case I feel he'd offer us much more on a wing/flank than as a part-time ruckman.
Could be the way they go. Either way I'd be surprised if there wasn't significant development time put in at VFL level this year. For one thing there's already Lonergan, Taylor, Rivers and Mackie in the backline. They can't add another guy even taller.