If Jesus rose after 3 days + 3 nights this would be the 4th day - so there's obviously some idiom here - either 3 days and 3 nights really means the 3rd day or the 3rd day really means the 4th day. (This can be demonstrated from many Scriptures)

So which is it?

"2Ki 18:9 In the fourth year of King Hezekiah, which was the seventh year of Hoshea son of Elah, king of Israel, Shalmaneser king of Assyria came up against Samaria and besieged it, 10 and at the end of three years he took it. In the sixth year of Hezekiah, which was the ninth year of Hoshea king of Israel, Samaria was taken."

I find this convincing that Hebrew idiom really means the lesser figure ie: Jesus rose on the 3rd day: NOT after 3 days + 3 nights

I'm not convinced there will be animal sacrifices. Ezekiel 38 is probably not meant to be taken completely literally in that Gog is unlikely to rely on shields and spears. Much of the theme of Hebrews is how Christ's death makes animal sacrifices obsolete - surely these arguments are as valid after Jesus return as before.