I would want to think about various scenarios and what you would do in them.
Obviously, the best case scenario is that Sam is a sweetheart, immediately settles in, and gets on with Isadora, you and your family.
The worst case scenario is that he's a hormonal mature male who poses a danger to your other birds and your family. And you've thought about that: he would go to a good rescue who would match him with someone better able to meet his needs.
So what about the inbetween scenarios? What do you think you can cope with, and what are your "nope, can't do it" situations? Are there any dealbreakers? What kinds of behaviours are you willing to work with? What kinds of interactions with Isadora are you willing to live with, and where do you draw the line? What kinds of interactions with you, your kids and your partner are you willing to live with, and where do you draw the line? Basically, what are your criteria for it working out vs not working?