Apparently Korah didn’t understand the “burning bush incident”! Moses and Aaron were God’s anointed. They didn't need to be replaced.

Jude 1:10-11
Yet these men speak abusively against whatever they do not understand; and what things they do understand by instinct, like unreasoning animals-- these are the very things that destroy them. Woe to them! They have taken the way of Cain; they have rushed for profit into Balaam's error; they have been destroyed in Korah's rebellion.

When God does things, He certainly does it up right. Wouldn’t it have been enough to just have Aaron’s staff sprout? That was all He promised them to prove Aaron was His chosen one. And yet, He caused the staff to bud, to blossom, and to produce almonds! And overnight even!
Now, let’s see…what was that Scripture about God being able to do more than we ask for…oh yes, here it is.

Eph 3:20
Now to him who is able to do immeasurably more than all we ask or imagine, according to his power that is at work within us,

Tapped into His power lately???