Hey Anthony,
Thanks for the question.
4 months is usually a sufficient amount of time to wait before placing your implant–unless there is some underlying medical condition. For example, diabetes or smoking can alter healing.
I can definitely see the dimensional changes you mentioned, but the bone inside the socket looks how I would expect it to look.
What I do see that is missing though is a nice cortical shell formation at the top of the socket. If you wait longer, sure, you will get a better cortical plate formation for you to feel more comfortable placing your implant. But I think it is also totally possible to place an implant as is.
As far as size selection, I would be comfortable with a 4-4.5 mm width and a 8mm length. The position of your ruler over the site is not exactly on the bone (the lines extend out a little bit) so I would rather be a bit more conservative.
If you feel more comfortable and the patient is not in a rush, you could definitely wait a little–perhaps 2 or 3 more months before placing your implant. However you would not be wrong to place them now.
Your opinion on this @vorholtdds ?