What We Know
If there's one thing this man needs, it's time to get to know someone, and determine if they "have the right chemistry to work together" as Oliver might put it. Part of me wants to think that when Joe tells Oliver he's "hand[ing] it over" that the "it" implies not only his lingering hurt over the Kate situation, but handing his desire to find someone to spend his life with to God, too. That said, you shouldn't be looking for Joe to have a girlfriend in SSD8. And even if someone does get introduced, I think I have some ideas of whom it will definitely NOT be...
Not only does she fall under the category of someone Joe doesn't know very well, except in the context that Oliver presents her in---as a backward-facing alternative to Shane---Dale's function in the story makes it likely that we won't be crossing paths with her again. Dale served a very specific purpose in transitioning Shane and Oliver out of their respective valleys, helping to lead them to each other. Dale's role in things is technically over---and for a more thorough reason than I can even get into right now, but stay tuned! That being said, when you remember that Martha wastes nothing, you can almost guarantee Dale won't be back because she won't have anything to contribute to the story. And I certainly don't see how putting Joe and Dale together could contribute anything substantive to any narrative from here on out.
But above all, it just shouldn't happen. If I were to entertain the idea at all, the following reasons would eliminate her immediately: They are at different places in their lives---Dale is career-oriented and Joe is retired---he wants someone to share completing his list of buckets with, counting her out. Just because she can't have Oliver doesn't mean her interest would shift to dad---even considering it kind of makes me queasy. It's just a hard pass.
Not Shane's Unidentified Mother
When it comes down to it, this is the blind pairing that bothers me most. It's probably even worse than pairing Joe with Dale. First of all, we don't even know this woman, aside from day-late birthday macaroons and preserving "the last rose of summer" this mystery matriarch is exactly that---a mystery. In fact, at this point, Joe probably doesn't even know that Shane even has a mother that's alive, let alone single and ready to mingle---it has never been mentioned on-screen with him present.
Let's allow Shane's mom the opportunity be her own, independent, entity, with her own unique contributions to the narrative, uncomplicated by some pre-conceived notion that she should end up with Joe. Please?
But if you asked me, her name should be "Mary." Get it---Joseph and Mary? And that is literally ALL you will hear from me in the way of suggestions, and I am TOTALLY ok with that.
Resting My Case,