There are far worse contracts out there
Take a look at Allen Crabbe and Evan Turner. Similar stats to Snell (neither as good defensively) and they are both making 18MM per year!! Makes Deladova contract seem reasonable.
I'm OK with Delly as he is good on D and he will play a lot of minutes at either G spot. Teletovic and Henson are different in that where are they helping? Even if Moose goes I don't see Henson getting time as Maker is going to get a lot of minutes. Teletovic can fit a need but dude was atrocious in 2016.