User blog comment:YourPrivateNightmare/Discussing the new defensive mastery tree/@comment-180677-20150626064957/@comment-180677-20150626093747

Not every jungler can jump (just to remind you of that). There are still some that either have to flash or run at enemies with high speed (who get kinda ruined by slows in the end). Add to that I tend to play champ of the latter type.

Who says that you can't take the damage-reducing ones along with Swiftness? Honesty, these 4 points reduced damage aren't really helping that much later for a jungler who is gearing up with defensive items anyways. At higher damage ends (like criticals), we still got "Reinforced Armor" to deal with that.