One question, answered from the books

When should a jungler give Dragon?

Give Dragon the moment you know no lane has priority, and give it before the fight starts, not after you lose it. A conceded Dragon costs one objective. A contested Dragon without priority usually costs the Dragon, two or three deaths, and the next play as well. Concede it cleanly and take a real trade on the opposite side of the map: camps, a tower dive window, or Herald alongside the timing. Number two matters more anyway.

The decision, as a picture

What it looks like in a real game

Bot just lost the 2v2 and their whole team is rotating down river. The greedy line is sitting in a bush near the pit and waiting for a miracle. The disciplined line is already gone: their jungler is burning 40 seconds walking to a Dragon you never intended to fight for, and you are two camps and a plate richer on the other side of the map. You did not lose a Dragon. You sold it.

The concept: Kill discipline and the priority rule

Start Disciplined builds objective play on one check: priority first, objective second. The book prices the pit for you, Dragon is worth three to four kills, which is exactly why you do not donate three deaths trying to save one.

"The goal is not to always solo the Dragon; it is to always have priority on it."

"If all three lanes are in bad shape, skip the first Dragon entirely."