To all who responded. Thanks for helping to soften my anxiety. I would like to update.
As I mentioned Teimo and Skylar were mates for 13+ years and they were both puppies at the same time. Other than that they had very little exposure to other dogs, young or old. They had their moments, but don't we all, and as I mentioned in a previous post Skylar was always able to hold her own. Basenji's deal with their own problems in their own way and sometime the verbal sounds sound like living in a close Italian family (last name is Suraci).
Now as I look back over the last couple of weeks I realize a couple of things, Teimo still misses Skylar and he does not know how rough he is when he plays but is quickly learning. Elzear does not know about Skylar, but did come from a house with 1 brother and 3 adult B's to play with in a very savvy Basenji house. In the last 72 hours they have become almost inseparable and Teimo has rediscovered the B-500, something that Skylar wasn't able to do for several months. They still rough house, and we still run to make sure everyone is ok. We usually get there just in time to see Elzear swatting Teimo in the face or running back in there to attack again (Teimo's neck is always wet and Elzear's teeth are sharp). In the end they exhaust each other and end up sleeping for the next hour or so, robbing us of our play time with them.
As far as the running and exercising with Teimo, it is good for me and he just waits for me to say the word run when we are out on a walk.
Thanks to all who took the time to share. I hope you continue so that I may provide you with updates.:)