1)
Why does it say "Gam Osher Gam Kavod"?
1.
Radak: Each includes the other (both wealth and honor). This is like "Gam Tzonchem Gam Bekarchem" (Shemos 12:32)
2)
Will Shlomo's wealth and honor exceed only that of kings before him?
1.
Radak: All the more so, it will exceed that of other people 1 .