The MM property actually sits at the beginning of a slight bend in the road, which puts it's out further than the English property.
Whatever trees, vehicles, trash cans were in the line of site between the MM property and the English property are subjective. There's no way any of us could know that any of those objects were in his line of sight that day.
If TM was in his yard near the sidewalk, he could easily see the English property IMOO because his property sits further out than the English property.
My property sits in a similar fashion to the MM property, except on a slightly broader curve.
I can easily see the 10th house down the street.
I would easily be able to see someone in yard, however, I couldn't tell you if they were male, female,black or white. But I could easily tell that there was a person there.
To say that there is "no line of site" is simply unfounded atm. It's possible that there will be some media forthcoming that shows a view from the MM house to the English property.
I think the neighbor standing across the street while Arbery was in English's house may have contacted them. jmo