Toho Kaiju Clash Tournament

Below will be a list of classic Toho monster battles, and you choose the winners based on if one could realistically beat the other (their size differences, abilities, etc are all as seen in the movies). Round 1---- A--Final Wars Gojira vs Super Gojira {Winner of A vs Winner of B} B--Destoroyah vs Kiryu C--Space Gojira vs Bagan {Winner of C vs Winner of D} D--Kiezer Ghidorah vs Mecha-King Ghidorah The Champion Fight will be the winner of A-vs-B and C-vs-D. So, who do you think will win in this (classic Toho) fight?