Welcome to the forums! The inside pane won't cause as many problems as the outer one could. Yes, it will fog up, but you expect that. As long as the kids keep away from it, you should not have more problems of it falling apart. The crack may increase, and if it does, make sure you tape over it to keep shattering to a minimum should it decide to do so.

I never even thought about using the dremel or multi tool.. i'll have to check into that I dont want to spend too much time on it...because of the eventual replacement in 3 years thus the question... do I need to get it all out there. some other reviews i saw said the dap in a tube was good to paint same day or next day.

If you want a fast job and don't care too much about how it looks, use the glazing in the caulking tube. It takes a while to get onto how to do it without making a complete mess, so that's why I mention the appearance. You would probably be able to get better looking results with the Dap 33, since it's a lot more stiff you can shape it with a glaziers knife a lot easier, and clean off the excess easier. It will smear up the glass, though. Repairing glazing is one of those things where you just have to decide how good of a job you're going to do. The best way to do it is to remove all loose putty, prime bare wood with oil primer (wait for it to completely dry) then replace glazing points as needed (glass should be tight against inside stops, not loose at all) and then tool new glazing putty in with a glazier's knife, forming a nice neat triangle of glazing around the perimeter. You don't necessarily need to remove glazing that is still bonded to the glass and frame. Generally you don't want to go over it, other than maybe to blend the old in with the new. A thin layer of new glazing over the old won't usually hold up to the elements real well. If you're trying to cover up cracks in the old glazing... well, do what you have to do. Just be careful when scraping old glazing not to break the glass. 9 times out of 10, you will break something when trying to do a really good job. But doing a crummy job with the caulking tube glazing and then cleaning up any messes with a putty knife might be more DIY friendly. Hard to say... a lot has to do with your skill set.