It's fairly easy to do, but good players can mash out before you throw, and also can tech off the stage, both options putting DK in a somewhat vulnerable position off the stage. If you get footstooled or spiked out of your DJ, DK can't recover.
It's a useful tool, but not gamebreakingly powerful or anything, and certainly not enough to shift tiers.
Tiers aren't based around having a few good kill techs, but on overall performance, including approach, priority, spacing ability, killing power, recovery, individual character matchups, etc.
Tiers based off of tournament placing are also somewhat biased, as they are an indication of player skill rather than character ability.
