Although the SU35 (a derivative of the SU27) has a much lower RCS than the SU27, that does not mean the SU27 can be retrofitted to have that lower RCS.
In most ways, the smaller size of the Typhoon is an advantage in air combat- at close range smaller means harder to see. The size of the F15 (dictated by having a large enough nose for its radar) has been recognised as a problem since the 1970s- USAF exercises gave the F5 a surprising number of victories against the F15.
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