It was also speculated he was aiming to stay at his brother's in Clifton and passing Granby Hill is in the direction of his brothers house.
I confess I haven't read the full post, but do we know where within Clifton the brother actually lived?
Depending on that, I wonder if he decided to walk along Hotwells Road / Portway and up Bridge Valley Road, towards the Zoo. It's a very natural route for someone more familiar with driving than walking the area
you don't drive up Granby Hill unless you trust your handbrake and hill start skills.
Heading along that road throws up a few things
- there's no shops and only a very short terrace of houses, so little to no CCTV opportunities
- it sees him walking along a very long stretch of the River Avon, and some parts have low barriers between pavement and river. This section is tidal with flows that I think could carry a body, with a high range (rises and falls daily) and an awful lot of mud which I suspect could trap a body underwater. This is in contrast to some of the other areas, beyond the Plimsoll Bridge, which are essentially harbours, controlled by locks, and are much less 'natural' in terms of flows and mud (apologies if I've got some technical river term wrong here)
- Bridge Valley Road itself isn't especially treacherous, unless he strayed off into the woodland and cliffs near it. It has a decent pavement.

- There's a footpath that runs from the bottom of Bridge Valley Road up. I don't know that it's very well travelled; I know The Downs like the back of my hand but it's never occurred to me to go that route frankly.

- the cliffs of the Avon Gorge could be an absolute bugger to search without a drone; I am reminded of the tragic death of Charlotte Bevan and her newborn baby about ten years ago