Of course, there is evidence to support all opinions on any subject.
http://www.ufodigest.com/
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Why would they go to all the trouble of sweeping the inner wings forward 18 degree is they knew in advance it would not increase the critical Mach number?
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Our critical Mach number is raised by reciprocal of the cosine of the angle of sweep. So for 18 degrees of sweep we see a 1.05146 increase to critical mach.
So mach limit of Mach .8 becomes a new limit of .84.
Now at sea level that is represents a 30mph increase in speed!
Now the drag reduction is proportional to cos^2<angle of sweep>
Or a 9.5% reduction in drag.....
Not a bad call on the part of Mtt to add 18 degrees sweep based off their advanced knowledge of swept wing theory. By keeping the sweep moderate, they certainly avioded all the stability and control issues found with sweep angles and engine nacelles.
What is your opinion based on again?