There were way more than 144k resurrected at the Cross.
I never wrote that the 144,000 First-fruits were resurrected at the Cross. These 144,000 First-fruits Matthew 27:52-53 saints came out of their graves AFTER Christ's resurrection, on that same day that He arose. The resurrected Christ resurrected them all out of their broken-open graves around Jerusalem. The 144,000 First-fruits were also the "remnant of the dead" in Rev. 20:5 that came to life again in the "First resurrection" at the ending point of the millennium in AD 33.
These 144,000 First-fruits of Rev. 14:4 are the same as the 144,000 from all those stipulated Jewish tribes in Rev. 7. We know these were resurrected, glorified individuals because their bodies were "redeemed from the earth", and they were "without fault", with no guile in their mouth in a state of perfected, resurrected incorruptibility. They stood with the Lamb on Mount Zion in Jerusalem, which is what the Matthew 27:52-53 saints did on the same day when the newly-resurrected Christ was in Jerusalem. that day. They went into Jerusalem and were seen of many there.
It is the crowned Son of Man in Revelation 14 sitting on a cloud (at His resurrection-day ascension to the Father) which "harvested" that group out of the earth with the sickle. On this occasion, Christ did this "harvesting" by Himself, with no assistance from the angels, which would assist with gathering the resurrected saints in the next resurrection event.
These 144,000 First-fruits, resurrected Matt. 27 saints
remained on the earth in the days of the early church, serving as evangelists, pastors, prophets, and teachers to edify the body of Christ. They remained on the earth in a sealed, protected status which reserved them for their eventual rapture to heaven in AD 70, along with the rest of the saints resurrected at Christ's return.
The years of Great Tribulation starting in AD 66 could not harm any of these sealed, 144,000 resurrected individuals, since they were in a glorified, incorruptible condition in the eternal state which is impervious to any kind of harm whatever.