Dragon are the top hierarchy in creatures their aura alone makes animal in fear but drake creatures are created by dragon himself so they r immune to dragon fear

Dragon Fear in this refer to an innate species ability, not a class like structured thing. The 'Dragon blood' (I am assuming is the author's intent) has some innate benefit that blocks out that effect and that is what they were bred to have - for I assume they are meant to wage war against actual dragons in a cannon fodder / shock troop type position. If they locked up in fear every time they would be far less effective, the way I rationalize it is: if they can get a bite or cut in and cause bleeding there is added use if energy or resources beyond the move needed to kill the drake.

The Twins grabbed the tiger and were dragging it... not only that the Druid was moving via carriage instead of on foot or in the air. The initial circumstances that he would encounter the tiger cub are completely different. the likely original story is that the Druid came to find a dragon, stumbled upon the Cub while he was also trying to hide from the Drake, and they escaped together or some version there of.

There is no 'breaking of the story' (that I can understand) The rumours brought by Pablo literal say giant monster that suspected to be a Dragon; Wyvern is a flying lesser/sub-species of Dragons and Drakes are the ground based lesser/sub-species of Dragons (in most depictions). By the Druid showing up that 'added' the tiger [cub] to the possibilities, I can see how this would cause confusion though. It simply added a variable it did not replace anything existing before that, the greatest factor for this would be the question of: "How was he supposed to tame the tiger?" without poacher like activities that would make the ancestor of a "HERO" be a villain?

An easy mix-up, I make them all the time. I just hope that kinda explains it well enough so that it is more clear?