I seem to recall Vick and Jordan mentioning once on the 'At Home' podcast that they prefer presenting in a pairing/group these days. So while Vick might host solo sometimes it's only on rare occasions.
And with Going Home it's very much treated as a multi-person show. So while you can do the odd solo edition those in charge probably think you wouldn't want a week of it. Plus I guess it's a good chance to get Sam & Danni weekday practice and exposure (and same with Emil).
Because otherwise yep as you say Vick and Katie are both certainly capable of doing shows solo.