Is Dengar's special an ability that you WOULDN'T want to level up?
Tenacity down is better than DOT / TM reduction and wording on the ability says give tenacity down if at least 1 crib; but later ability leveled up gives DOT/TM reduction with 2 or 3 cries.
compare in game ability screen to
https://swgoh.gg/characters/dengar/
The only comparable thing would be intentionally keeping Ben weak to get him killed to benefit team...
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+1
it doesn't remove the level 1 ability. No ability in the game works like that.