semi, you are right in the fact that Heb 6: 4-8 doesn't support OSAS.
Heb 6: 4-8
 For it is impossible for those who were once illuminated, have tasted also the heavenly gift, and were made partakers of the Holy Ghost,  Have moreover tasted the good word of God, and the powers of the world to come,  And are fallen away: to be renewed again to penance, crucifying again to themselves the Son of God, and making him a mockery.  For the earth that drinketh in the rain which cometh often upon it, and bringeth forth herbs meet for them by whom it is tilled, receiveth blessing from God.  But that which bringeth forth thorns and briers, is reprobate, and very near unto a curse, whose end is to be burnt.
 "It is impossible"... The meaning is, that it is impossible for such as have fallen after baptism, to be again baptized; and very hard for such as have apostatized from the faith, after having received many graces, to return again to the happy state from which they fell.
Bill usually has ahout 50 chapter and verse that he rewrites the meanings
for, why not this time? Could it be the free ticket video?
Invictus, do you believe in OSAS?