Pretty untrue. Imran was pretty fast, but Wasim was north of 150k with ease in his peak.
David Frith cites Larwood's top speed in
The Fast Men as 156kmph, Frank Foster in the 1930s deemed Larwood's average speed was above 90mph, who cites Wasim as easily 150+ clicks? and even then, Larwood is faster
Waqar a yard quicker than anyone up to then barring Thompson and Patterson.
Viv never faced Waqar, moot point.
Like Voce Wasim and Imran are big tall men than Larwood, hence more bounce too.
They weren't short pitched or leg theory bowlers, though I can see them succeeding in that situation, but sadly they weren't, and I don't see any account of either Wasim or Imran getting steep bounce. It's not quite known how tall Voce was, so no comparison with Wasim or Imran is possible.
Then we come to WI bowlers. There was always one bowler who was faster than Larwood in their hay day. Starting from Holding, Marshall, Clarke, Patterson and Bishop, all were quicker than Larwood at their peak.
Holding Yes, Marshall? Hell No, Clarke? No, Patter? No, Bishop? No, and Holding wasn't just a short pitched spammer too. There's only one bowler in the 1970s faster than Larwood and that's Jeff Thomson, didn't have half his accuracy or skill though.
Larwood no doubt would have been a quality bowler. But claiming he is way better than Marshall, Imran, Wasim, Garner or Hadlee is just disingenuous.
Cricket is not a linear game, Mitchell Johnson was an overall above average bowler, yet he had THAT series against England in 2013-14, a series that even Wasim could not hope to renact, you can't just scale Larwood's achievements to the achievements of those guys because later are more skillful in their other ways, Same way Devon Malcolm took a 9fer and no other pacer has since and he was shite, players are allowed to have their own unqiue achievements dependent on form.
That might work with the average batsman averaging 30 or Siraj, who is basically a bunny. But against Viv, anyone bowling short at fast medium pace, what ever the field is going to go the distance. He has such fast reflexes, he would make room on off and play cuts and upper cuts. Viv was not your orthodox player, he was an innovator. We could have tested the theory if Viv batted more against Bruce Reid, but he was pretty comfortable against Mike Whitney.
Allen didn't bowl any Bodyline, he bowled out swingers at good pace to get wickets. Voce got away with Bowling leg theory because he had the left arm angle, swung it late but most importantly, he got extra bounce due to his action and height, allowing him to get awkward bounce that got him top edge. Larwood we all know, pinpoint accuracy, 150+, swing etc, but Voce was effective with leg theory because of the weird bounce, even if Viv hits two sixes off, he can easily upperedge the last one to one of the 7 fielders at the leg because the bounce of the ball would be different.
Plus, he wasn't some chump, he was a highly skilled bowler who could bowl both inswingers or outswingers, was very accurate and had extra bounce at exchange for pace. Averaged 26 in the most batting friendly era of the game.
Reverse swing to start with.
Has nothing to do with short pitched fast bowling
evidence?
overall speed and skill of the fast bowlers improving,
That doesn't mean anything, average pacer today is faster than the average one in 70s, but that doesn't mean anything when discussing Jeff Thomson, same way it doesn't mean anything when discussing Larwood.
and improved fitness allowing hostile stuff to be thrown around for a longer duration.
Fitness has nothing to do with the ability to bowl leg theory, and both Larwood and Voce were extremely fit and had extremely long and successful first class careers, Thomson was injury prone, Holding was also less durable than those two, therefore less fit and/or biologically gifted.