Hello Michel,
these are interesting questions.
It's impressing that Many Souffan met Skalski.
Maybe also Matti Salonen will join in, he's proficient in German losses.
Jerzy Bajan who wrote the Lista Bajana seems to have preferred crediting Skalski with those kills.
http://aces.safarikovi.org/victories/lista.bajana.pdf
Cheers,
Michael