I think if Delhi doesnt get Gambhir(if KKR uses RTM), then DD would look forward to get Ashwin at any cost and make him as captain. Also KXIP, if they are not sure of Yuvi as captain, then they might as well look for Ashwin as captain for them.
CSK will equally want him but being a local lad as well as an established international player. But if the price goes out of range, then Washington Sundar will be the most ideal replacement for CSK.
Teams who already have captains:
1. CSK - MS Dhoni
2. RCB - Kohli
3. MI - Rohit
4. RR - Smith
5. SRH - Warner
Teams looking for a captain:
6. KKR - Gambhir
7. DD - Ashwin
8. KXIP - Du Plessis