Could Theo and Jack know each other?

When I was rewatching S2 ep6, I noticed that Jack Featherinton distinctly turned when Eloise walked by while mentioning Theo's name. I also noticed that many of Jack's scenes were directly before Theo's.

Did anyone notice any other connections? It is very subtle but seems more than a coincidence. Maybe another mystery to add for Theo's background?

All theories welcome!