With the relatively small amount of urine is there any chance he is “leaking” like from an emerging UTI or something?
Also, have you noticed any pee drips elsewhere? My male dog had a hard time controlling his bladder for the first 5 years (yes, years). He would drip and splatter pee multiple times a day, mostly when excited and scared but also sometimes just because he didn’t have full control.
In terms of the size of crate… I believe the old rule of thumb was something like - enough room to stand up, turn around, and lay down in. My dogs have always had crates that are slightly larger than required, but that crate looks like it’s big enough for 3 dogs of his size, theoretically.
Honestly, until you get him neutered I wouldn’t worry too much about it, just make sure you’re staying on top of clean bedding as much as possible for him. He’s had a lot of change and adjustment and if it’s not puddles it could be many things. Keep an eye on him, though, for anything like a potential UTI. Those can get scary, fast!