Scuttle Crab is bullshit
It favors fast junglers who can clear jg and get to river fast, who can scrap early at lvl 2-3, who have a CC spell to break it's armor, and directly punishes junglers who can't because of it's huge Gold and EXP spike
And there are TWO of them to start the game but there's no guarantee you can outpace the enemy jgler and get a single one.
If your champ is weaker early and you just want to clear your own Jg, you automatically lose EXP and Tempo