hello again Lourens,
This is a touchy subject, same is with feeding your snake live or thawed mice, it depends on your preferred method, for example my 2 kings I had, my female only took thawed mice my male took anything, except rat pups ? don't know why.... you see where I'm going with this?
I believe that they must be hunt their food, as that gives them exercise and not obese.
I am not a big fan of leopard geckos cause they are so fragile, I prefer the bigger animals.
To give you an answer, crickets may attack your gecko if they do not get food, and if there are to many they can do some damage if not kill your gecko!
with this keep a tub of gutload in the enclosure for the crickets and 4 crickets per gecko and that should do the trick, mealworms.. I don't feed anything mealworms! I use roaches, earthworms, crickets and silkworms and them in their moth stage, I gut load my crickets with a tinge of calcium powder (of which you can also leave a small tub in the enclosure).
Ultimately it is your call, there is no actual right or wrong method when it comes to most cases with reptiles, there is the advised and not-advised, but not-advised is not wrong so to say in some cases.
I hope this can help you in any way
“Motivation is what gets you started. Habit is what keeps you going.”
- by Jim Rohn -