I don't think he looks dehydrated at all. His head pads are good and his eyes are not sunken in.
I do feel that your gutloading/feeding of the insects needs improvement though. I use a wide assortment of greens and veggies such as dandelion greens, kale, collards, endive, escarole, card it's, sweet potato, sweet red pepper, zucchini, squash, etc and a bit of fruit such as berries, melon, pear, apple.
Supp!ements should be...
Phosphorous-free calcium powder at almost every feeding, phosphorous-free calcium/D3 powder twice a month lightly and a vitamin powder that contains a beta carotene prOformed source of vitamin A twice a month lightly. You may need to give him a vitamin prEformed A once in a while too.
I'm still a bit concerned about the cut...please post a couple more photos if the foot from the top or side.