We see this type of language elsewhere in scripture…
Lu 15:7 I say unto you, that likewise joy shall be in heaven over one sinner that repenteth, more than over ninety and nine
just persons, which need no repentance.
Luke 5:31 And Jesus answering said unto them, They that are whole need not a physician; but they that are sick.
32 I came not to call the **“righteous”, **but sinners to repentance.
These are people that are righteous only in their own perception.
Sanctified - as you point out in Hebrews 10 can mean an abundance of things…see its use in 1 Corinthians 7…there are other ways to look at this as well. His sanctification can be seen as something that he only perceived but was not a reality.
Heb 6:8 But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.
9
But, beloved, we are persuaded better things of you, and things that accompany salvation, though we thus speak.
10 For God is not unrighteous to forget your work and labour of love, which ye have shewed toward his name, in that ye have ministered to the saints, and do minister.
This passage immediately follows another passage that you list…falling away does not accompany salvation. Not to meniton that there are many places in that passage that say that there was only tasting going on…“partaker”…this means they only were in association with the Holy Spirit…they were not indwelt. Tasting does not give you indwelling.
There are others, I know, but I cannot address them now. Only look at the rest of scripture and place all of these in context. I cannot let a handful of controversial passages (that can be explained in other ways) get in the way of large portions of scripture passages as well as many other scattered small and large passages that are clear and concise.