A thought on the sameyness of the bowling attack:
We use mph, so we naturally see 90 mph as the big pace barrier, but I think kph gives a better barrier: 140 kph is 87 mph. Anything over 140 kph is fast, and while only a few bowlers can hit 145 kph (90 mph) regularly, quite a few can regularly stay up at 140+ kph for a whole spell. That, for me, is a pretty good definition of 'fast' as opposed to 'fast-medium'.
In the absence of Finn/Wood, Plunkett's the other bowler who qualifies for this tag. He's the most Morkel-like hit the deck bowler, too - extracting bounce.
I don't know Footitt so can't comment on him, but none of the other bowlers really qualifies for this tag, except very occasionally Broad when the stars align for him. In a five-man bowling attack with four seamers, which is what they'll have, there has to be a place for at least one 'fast' bowler by my above definition, especially in SA.