You may be right I'm not 100% sure that the jetpack is in the game, but I really hope so
How are you going to make a compelling argument that it IS NOT logical to put the Jetpack on the mural and not in the game? To tease gamers with the notion of a Jetpack and create a massive Easter Egg hunt to find it is damn logical. It's called SALES LOGIC.
I agree with the logic that if the Jetpack is on the mural, IT SHOULD be in the game, but saying to put the Jetpack on the mural and not in the game IS NOT logical is an illogical statement. There are lots of reasons for doing lots of things.
Rockstar has said the game will morph overtime (single/multi-player), this we can be sure of.
I believe a Jetpack is intended to be in the game, but at this point, I don't believe we're any closer to finding it than when we started.
We have tons of facts and tons of clues, therefore, we either aren't adding everything up correctly, we're missing something(s), or the JP doesn't exist...YET.
I love all the thought and attempt to find answers to this mystery, it is clear that when the jetpack will be found it will not be the best thing in the game
And I wrote my previous response in a slightly humorous way