It's too much of a risk for Ajay to clash with Aamir unless he has Rohit Shetty by his side. Secret Superstar was a small film but TOH is an Aamir Khan movie so Ajay is not going to stand a chance. Total Dhamaal isn't a strong franchise compared Golmaal or even Housefull despite its success at the BO. I know Ajay likes having a Diwali release but he should know the diffrence with SS vs Golmaal & TOH vs Total Dhamaal.
I've never liked the Total Dhamaal franchise but its not as worst as Housefull. So I don't really expect nothing at all from the 3rd one unless Indra Kumar can cast Madhuri Dixit. I want to see her and Anil Kapoor reunite together.
Ajay Devgan signing film is probably understandable maybe he liked the role and script. Hopefully after wraps the shooting, he can get started on Tanaji Malusare or Singham 3 as soon as possible depending on which one he chooses.