I don't feel it's odd or inappropriate to question what's going on here. And, it's certainly not out of lack of respect or affection for Jake. If I didn't care about him I wouldn't care whether about how he reacted to Heath's passing.
Essentially, Jake is a public figure with publicists and an active interest in engaging with the public and probably particularly his fans. This is a case where his fans are interested in what's going on and are showing concern for him. I don't think there's anything at all wrong with that.
I'll just reiterate what I've said multiple times now (in multiple threads)... Jake was Heath's most significant co-star in Heath's most significant movie. We've heard from almost all of the key individuals associated with Brokeback at this stage, with the most recent being Anne Hathaway. Jake's silence just seems glaring with these factors taken into consideration. Added to this Jake is the godfather to Heath's child, essentially making him a symbolic family member. On an etiquette level, at the very least, a brief eulogy-type statement does not at all seem unreasonable.
But, it is true on a personal level, I'm really hoping to hear from Jake in terms of coming to closure on this for myself. That's just how it is for me. I'll feel particularly unsettled about this until he's heard from or until I have a better sense of what's going on. And also, as a Brokie, it just seems logical that this would be a concern and a particular interest.