I think that you have the right Daniel GARNER. Have you seen the reports of his death? Inquest held 12 August 1856 - this report in Leicestershire Mercury, Saturday, August 16, 1856, Vol. XXI, Issue 1049, p.2.
Not proof, but the naming of Eleanor also seems to support your view.
Then there is an item about the first anniversary of the Leicestershire Agricultural Society in 1834 which mentions Daniel GARNER (born c1757) of Hoby, who I suspect is the one who married Sarah FEWKES in 1783. The clipping from Derby Mercury, Wednesday, December 17, 1834, Issue 5344