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Indeed - he had access to something far more useful than source: the AmigaOS 3.1 autodocs. Much easier to work backwards than to try to untie all that un-compile-able weird non-ANSI C and 68k ASM. That's why OS4 did exactly the same and like MorphOS went through the same years of "lamerising" their functions to match undocumented bugs to get that compatibility. The OS4 core devs just won't admit it, but they know it.

Has the same thing happened in MUI4? No. They clearly had the source. Which brings this circular argument back to the beginning: they either were given it, or they stole it. However, that isn't what the recent furore is about - it's why they think they have the right to call it MUI5. MorphOS did not call itself AmigaOS 5...

(...although I've always thought it should.)