You make an excellent observation. The "time of Jacob's trouble" belongs exclusively to Israel . It would be proper to say the "time of Israel's trouble" which is the Gog-Magog War of tribulation judgment from God, Himself , which happens BEFORE the resurrection / rapture of the Church according to ;
Ezekiel 38:16 ( God speaking to Gog )
"And thou shall come up against My people of Israel ( Jacob ) It shall b e in the latter days that I WILL BRING THEE against My land ( Jacob / Israel )....."