I would say that there would be some major issues if they had been saved and not received the Holy Spirit of promise to those who believe. I also do believe there is a difference between the regenerating work and the sealing of the Holy Spirit. Regenerating is not sealing although many non-cals highly disagree.
Well, you have a major issue then, because the scriptures clearly show many people who believed who had not received the Holy Spirit yet.
John 7:37 In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink.
38 He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.
39 (But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)
These people were believers but had not received the Spirit, because Jesus was not yet glorified. That occured after his resurrection.
There are many examples of this.
John 4:39 And many of the Samaritans of that city believed on him for the saying of the woman, which testified, He told me all that ever I did.
Not only did these Samaritans believe before the Holy Spirit was given to them, the scriptures say WHY they believed, for the sayings of the woman.
John 7:31 And many of the people believed on him, and said, When Christ cometh, will he do more miracles than these which this man hath done?
These people believed on Jesus because of the miracles he performed. But they did not have the Holy Spirit.
You can choose to believe people are regenerated by the Spirit to have the ability to believe, but there is not even one single verse in all the scriptures that says this. If you think there is, I would love to see it. But to the contrary, there are many scriptures that say people believed on Jesus before the Holy Spirit was given. And in many cases these verses explain why they believed. Not once do they ever say a person was regenerated by the Spirit to believe.
No, people have the ability to believe. The Samaritans believed because of the saying of the woman who spoke to Jesus at the well. There was no magical, mystical event here. The scriptures specifically explain
why they believed.