The short answer to the OP's question is "NO." The longer answer has two components:

Humans already in Heaven

We are not told how many humans are already in heaven but we know of at least three: Enoch, Elijah and Moses. How many more, is unknown. Paul's man "caught up to the third heaven" was presumably only a temporary visit because he told his story to Paul afterward. We do not know if he later returned to heaven or not.

Further the fate of those raised at the special resurrection described in Matth 27:52–53 is also unknown. Whether they we later translated to heaven or died of natural causes, we do not know.

Eph 4:8 - Captives or Captivity?

Let me quote Eph 4:8 very carefully:

Therefore it says: “Having ascended on high, He led captive captivity, and gave gifts to men.”

Note what this text says and what it does not say. It says nothing about captives (plural) but He that led captivity (singular) captive (the verb is also singular), ie, an abstract noun suggesting that Jesus had led away whatever was keeping people captive, ie, captive to sin - Jesus' ministry liberated sinners from the captivity of sin.

In doing this, Jesus enabled the distribution of the spiritual gift to men as described in the previous verses and 1 Cor 12 and Rom 12.

Gill expresses this well when he says:

he led captivity captive; which is expressive of Christ's conquests and triumph over sin, Satan, the world, death, and the grave; and indeed, every spiritual enemy of his and his people, especially the devil, who leads men captive at his will, and is therefore called captivity, and his principalities and powers, whom Christ has spoiled and triumphed over; the allusion is to the public triumphs of the Romans, in which captives were led in chains, and exposed to open view