Just thought I'd offer some defense in Schumacher's name here. I should point out, there is no reason to think that the McLaren Senna drove in 1993 was any slower than the Benetton Schumacher drove. The statement: 'Senna's car had an inferior engine therefore Senna's car was inferior' does not really hold if you think about it.
Senna's McLaren was a little down on power but then his McLaren had the best electronic driver aids - launch control, active control, traction control in the field. So good were these driver aids compared to Williams, Benetton, and other teams, that Senna was able to make the best start of anyone and be passing 2 or 3 people before the first corner, and never lost a place off the startline himself. The traction control also gave him better grip in all slow or medium speed corners.
At his famous first lap drive at Donington in 1993, Senna had the best car in those conditions. Senna had the most refined traction control in the field, along with various lesser driver aids. Schumacher's Benetton didn't have several of those aids, and didn't even have traction control - that came 3 races later at Monaco.
As for Schumacher having little competition - drivers like Prost, Piquet, Mansell were quoted. Schumacher drove his 2nd, 3rd, 4th, 5th and 6th races as Piquet's teammate. He outpaced Piquet in qualifying every single time, outqualifying him every time except the final race where Schumacher's gearbox was playing up in qualifying, costing him half a second on his fastest lap.
So the points I made are:
-you cannot say with any certainty that the 1993 McLaren was inferior to the 1993 Benetton.
-when you say Schumacher did not have Prost, Piquet, the 3+ WDCs to compete against, you should bear in mind that rookie Schumacher destroyed Piquet in 1991.