Hello! What a cutie, I see the temptation.
I have three Birds with a fourth on the way, my are all small. I have a Bourke Parakeet and two (soon three) Parrotlets.
Somewhat like yourself, I went to Petco for some Nutriberries and made the mistake of finding a little 9 month old Parrotlet who was unloved and scruffy and had been returned once already, so of course I bought him home.....lol
In taming him I have realized he is soooo happy around other birds, but my female Parrotlet and my Bourke want nothing to do with him. Sooo, I bought a FOURTH bird to introduce to him and hopefully they bond.
I totaly get that some birds can handle playing with some supervision and some need constant attention. I have both.
I personally enjoy personal one on one time with each of my Birds, and adding another one always makes that difficult. I almost bought two more because I couldn't choose LOL but thankfully I resisted.
Here are the things I considered:
*Will adding another bird still allow me to socialize with with my current birds to the extent they are balanced, and happy and get the attention they deserve?
*If they can't handle playing together, will they still get enough time out of the cage?
*Am I able to commit to another bird for its entire life span, in my case, up to 15+ years?
*What future life events am I planning and will I be able to handle all of them without being overwhelmed?
*Can I afford vet care for all of them?
*Will I be able to make arrangements for them if I take vacations?
*Am I willing to train them and put up with the frustrations?
I know that's a lot of things to consider, that's just my list. I try to think of the best and worst scenario, like happy birds everyone gets along, and a possible no one gets along and I have the responsibility of giving each one a good life and companionship. No one can predict how a dynamic will change.
I don't have any birds big enough to scream, but I could not handle it. From what I understand Conures are quite loud. It's personal tolerance. Try YouTubing it and you'll get an idea.
I think going back and interacting with him is a MUST before you decide. See how you get along.
If you get along and you consider everything (good and bad) I totaly support adding a flock member if thats what you decide. I know of some Conures that sound like a lot of fun, and great companions.
Keep us updated! Long post back at ya'