Jinzo Returner and Vanity Fiend

[HorusMaster]

I know that Royal Oppression cannot stop the special summon of Jinzo from the graveyard if Jinzo Returner is destroyed in battle and sent to the graveyard, but will Vanity Fiend keep you from special summoning Jinzo by the same situation (during the damage phase0?

 

[Maruno]

Why can't "Royal Oppression" stop "Jinzo - Returner"? Seems to me that if you can chain it directly to Returner's effect, it'll work (of course, you can build up a chain with several simultaneous effects in such a way that this can't happen).

"Vanity's Fiend" forbids Special Summons of any kind. As far as I know, you cannot choose to activate "Jinzo - Returner"'s effect while it's around.