[stuartj]

Lets say press on driving, at the track (ofcourse). You are in 5 at 120mph and you need 2 out of the corner at the end. You need to brake the car hard, and be able to stand on the go pedal early as possible with 4000rpm already on board in 2nd gear- and keep the car balanced.

DC clutching through 5>4>3>2 means you are going to busier than a one armed wall paper hanger while trying to threshold brake and steer the car from high speed at the same time. Every time you do it, you stand the chance of stuffing it up. Declutch-shift-clutch-declutch-shift-clutch through 4/3/2. And the guy behind you will drive right past.

Some will say, brake, then shift 5>2- the mantra being "give yourself the least number of things do to" This makes sense. The only only way to get from 5>2 and match engine/road/driveline speed is via H/T shifting, either straight into 2 at the appropriate road speed or via 4/3/2 ( because we all like the noise).

If you cant H/T while threshold braking, you will likely breifly compression lock the rears and/or unbalnce the car while its standing on its nose under brakes and very often have a spin (especially in a rear engined car), or least an untidy corner. Or worse, blow something up as the engine tries to pull 9000rpm as you engage 2nd with 1500rpm on the dial.

DC is just slow and complicated, and unneccessary. No-one, except the vintage car guys, does it. H/T allows you to correctly match engine/drive train/road speed for a smooth and importantly-balanced downshift. Good technique on the road, kind to the car- fact is, once you master it, its almost impossible to drive anything any other way.

Again just my 2c, YMMV. Hope that helps.