OT of all OT's - I have a Mgocat Question About....Cats

Mates, 

With apologies as to the level of OT this is, I am hoping for some insight from you mgocat owners.  We're not cat people but we've had a series of barn cats over the years that have been wonderful residents.  Our present barn cat is at least 10 yrs old, kills everything in sight, trained like a dog (will come to me when I snap my fingers), likes people, etc.  He's still in great health but he is getting old.

Now for the yesterday's true story: I was biking on a logging trail and a logging buddy of mine is on the side of the road next to his rig, and there is a kitten there that he's just finished cleaning up with wipes:  the kitten had been abandoned and was a mess and had a signif leg cut.  The kitten was very sweet, seemed to like people, guessing it was maybe 15-20 weeks old?  A female.  I told my buddy to take it into the local vet and I'd pay the bill with the idea that she could be a companion to our resident barn cat.

But here's my question:  Do cats get along in that type of scenario?  Our first loyalty is to our resident tom cat, but maybe a kitten with room to roam would be no problem for him?  

Thank you mgocat people and mods, feel free to nuke this OP, but hopefully not until later this morning assuming I get some substantive feedback.

XM