Don't worry about DS2. That all sounds normal and it's far too young to think about that. God my DD2 lives for shoes.
Seeking an opinion doesn't mean he has it. You're just following up a suggestion.
Not following this up doesn't mean he doesn't have it.
If he does have it he just interacts and learns differently. A diagnosis doesn't change him. He will still be the exact same sweet boy. You will just learn how to better interact with him.