If a pup isn’t a biter during teething, could it still develop the habit into adulthood?

My pup is teething right now. He's super gentle and doesn't bite humans at all. Just sniffs and licks. But he does enjoy biting on his toys a ton.

I assume that's a good sign. Chances are he won't develop a biting habit, right?

A friend of mine has the same breed and he's uncontrollable. He'll bite ANYONE's ankles except for his human parents. I want to make sure my pup NEVER gets like this.