Last year, a researcher produced a nice dataset that happens to be uniquely well-suited for use in a study I plan to carry out. At this time, I am in the process of applying for funds. Does it make sense to contact him asking if he would be interested in a future collaboration which, provided the project is funded, would commence in 2019? The advantage of doing this now would be to mention the potential collaboration in my proposal. Note that the data is open access, so I could just use it without contacting him. Nor is he anyone famous, but I feel that a connection would make my project appear more concrete and realizable. I wonder how all this might be perceived by him however, what would you expect?