yitay: “The Rashba is in Volume 1 Teshuva 495”
Yitay: To borrow from the Rashba you mentioned ?? ??? ?? ???????.
Furthermore, even if you will insist that the Rashba is describing a general definition of Ein Kavanaso, then his ruling is incompatible with the Terumas HaDeshen cited in SA YD 84 and many other cases I quoted previously from SA and other Poskim. So even if this would be the intention of the Rashba, which I still highly doubt, there is no reason to assume it is the accepted Halacha.