Isabella isn't included among the Cardinals' three starting receivers heading into Sunday's game against the Lions, Darren Urban of the team's official site reports.
Larry Fitzgerald and Christian Kirk appear locked in as Arizona's top two receivers, while veteran Michael Crabtree is included in the starting group on the team's first depth chart of the regular season. Even if Crabtree doesn't ultimately start, Isabella isn't believed to be the top candidate to fill the opening, as Trent Sherfield, KeeSean Johnson and Damiere Byrd are listed as the second-string options on the depth chart. At this stage, the Cardinals appear to view Isabella as more of a developmental project than a player being counted upon to make an immediate impact as a rookie.