Same as Hawkfan. But I would bet that it'll be closer to 4 by season's end. Expect to see the 4-5 range well represented if we're talking number of snaps relative to who starts on day 1.
Young, Hall, Bradford and Charbonnet all look like they'll get close to 40% even if injuries don't factor in. In all should get very strong contributions from the day 2/3 picks.