I would like one question,why is not included in this part of the E4 Messer?

[Matt255]

Originally Posted by David603

The Spitfire Ib is confirmed, so hopefully it will have a historical failure rate. Otherwise it will be the plane of choice for RAF pilots, since the Hispano is probably the best aircraft gun of WW2.

Were has that been confirmed?

Based on screenshots, videos and reviews, these are the Spitfire variants:

2x MkI (one with two-pitch, one with CSP, most likely)
1x MkIa
1x MkIIa

I never read anything about a Ib ever, nor have i seen a screenshot of it. If there will be a 5th variant for the Spitfire and only the E-3 and E-3/B for the 109, it would be a bit suprising.