not to be overlooked is the fact that the apostles, first recipients of the symbolic "flesh and blood" of John 6 . were only prospective anointed, had still an earthly hope, hope of an earthly Israelite kingdom ( read acts 1: 5,6,7.
all christians, even wt adherents, are prospective "sealed ones" of Rev.7, possible future "anointed", therefore following Jesus' action, all present should partake. "eat, drink all of you".
If wt makes a "reject the everlasting life offer" out of it,
do it privately at home. after all,
the last supper was a private exclusive affaire. so, follow Jesus' instructions. wt pressure notwithstanding.