That's how I personally think it works, though there is little to hold that up in the books themselves, as most of the Radiants we've seen have been much more Honor-sided than Cultivation-sided (discounting Lift, because she's an oddity in a lot of ways regarding this). Szeth says that Radiants can hold Stormlight better when compared with the Honorblades, because the Honorblades are a prototype that eventually the Radiants mimicked with different methods (spren vs Honor directly infusing the Heralds). But, yes, there will have to be some studies done (or just asking Brandon).