Dolphins' Jay Ajayi: Joined by Foster in Miami backfield

Joining Ajayi and rookie Kenyan Drake in the Dolphins' backfield is newcomer Arian Foster (Achilles), who signed with the team Monday, the Palm Beach Post reports.

Analysis:

Prior to the signing, Ajayi had topped the Dolphins' running back depth chart following the departure of Lamar Miller, with Drake a candidate to see change-of-pace duty. Now that Foster is in the fold, Ajayi will now face legitimate competition for the team's starting job, though the highly accomplished Foster has much to prove, health-wise, given that he is bouncing back from a ruptured Achilles. In any case, Ajayi's fantasy stock takes a hit due to the addition of Foster and the possibility that some form of a timeshare could be on tap. Meanwhile, the odds of the likes of Damien Williams, Daniel Thomas or Isaiah Pead making a significant impact for Miami this season appear diminished by Monday's roster move.