Just to be clear, are you saying that in one 40 watt SR, he would have had at least 4 200 watt speakers(possibly more if using 300w JBLs), totalling 800 watts or more? That seems like quite the mis-match?
I don't quite follow what you mean by "miss-match". I think you might be confusing wattage with resistance.
You can use any high wattage speaker with any guitar amp. There is no need to match wattage rating to amp wattage. in fact, if you run a 50watt speaker with a 50watt rated amp, you will probably blow the speaker since amps produce more actual wattage then their rating (long story why...)
Ohms (or resistance) is what is important to match. A 2ohm super reverb transformer wants to see 2ohms. This means FOUR 8ohm speakers wired in parallel. Or an 8ohm vibroverb transformer wants to see a single 8ohm speaker (or in the case of SRV, he used 4ohm bassman transformers in his vibroverbs which DID cause a missmatch... a big part of his sound IMO)
I ran a 67 super reverb into a quad of 300watt EVM-10M speakers (thats 1200 rated watts) for 5 years of gigging. Amazing sound. Eliminating ANY speaker distortion gives MUCH better sound from my point of view.