Terry just wasn't up to it, a good rock and roll drummer for sure and therfore great for the "thump thump" you need for live work, but not exactly subtle. Technically, and in terms of inventiveness, Terry just wasn't in the same league, not even close. No way Terry would have come up with that great drum part on Water of Love or the cool hihat work on Sultans.
That said, I do think Terry is a great drummer, just not as good as Pick.
The studio original of this one is probably my fave playing from Terry:
And the original of this one:
Hehe dusty, we're gonna be at this forever. Here I go then.
Can you exactly say what is inventiveness? I mean, how can you say that e.g. hihat work is inventiveness (or anything else for that matter, of course not some scientific discovery), and that e.g. the MFN drum intro isn't? One does something in a certain way, other one does it in a different way. Different things are natural for different people.
For me, very inventive is e.g. OUATITW, or ToL, or SoS to just name a few. Inventive when compared to Pick's playing.
That's true that Water oL is great, but I don't like that kinda a style much.
As for the Sultans, the hihat is great too, but:
Listen to 1981 versions, outro. Pick sounds to me that he doesn't know what to do there, double rhythm and such stuff, when MK is playing all these fast licks, it doesn't add up to overall energetic feeling. It just isn't very convincing (the same goes for OUATITW). For the original versions, he was very good there, but when DS were moving into more rock&roll music, he just wasn't the man to do it. Also listen to Terry's swinging right hand..., and the drum rolls in chorus (you probably don't like that, I know :-) ). I think he took DS onto another level when MK wanted to play more rock&roll.
But, on the other hand, Pick was GREAT on the LoG album, I don't know why but it just sounds fantastic. It never rains album version is better than the live version, imho.