Re: Could I use this?
Looks like you have a couple of options. Find a motor for the boat you have or find a boat for the motor you have.
Seriously, if you expect to carry much more than you on a regular basis that 12 footer will seem small pretty quick. I see you have a much bigger boat in your sig so perhaps this jon boat doesn't need to haul the family. You still have water and weather considerations where you plan to do most of your boating and might want something with higher sides a bit more heft.
If the 12 footer is indeed right for you, though, you could probably get a pretty good dollar for the 25 and put it towards a 9.9 which would do just fine on that boat.