I'm applying for a post-doctoral research fellowship in the UK, and a key part of the application is finding academic collaborators for the research. I already have two strong international collaborators, but I would also like a UK collaborator.
Now, one potential person -- let's say Prof. X -- would be a great collaboration, but they are also the person who is closest to my line of work in the UK. This means there is a good chance that they would be chosen for peer-review of my proposal, and I am confident they would give me a high score because I know that they think highly of me. Of course, if they are listed as a collaborator, they will not be asked to review.
Given this, I'm wondering whether it is better to take Prof. X as a collaborator to boost the quality of my application, or leave them out because there is a good chance they may be a reviewer and give me a high score. What do you think?