I like that (blue text) description Frank. It is succinct and accurate (in my opinion) and clarifies that there is still research to be done.
And I do think that a definite "one or the other" cannot be fully determined whilst the question of whether rough grinding of base finishing at Strathearn remains outstanding.
On the point of "transitional" as a description for any item from the Vasart / Strathearn changeover period, the same thing applies to late Strathearn / Early Perthshire Paperweights items. Unless, of course, for PP we do know that Vases, Bowls etc. had clear indications for maker, unlike the paperweights.