When looking at Hebrews, God is speaking to A Son- Jesus. Not "sons of God". This is specific to Jesus vs an angel. Heb 1:2-8 - these verses clearly define The One. Jesus.
Yes, it is true that it is talking about Jesus, but that does not change that ALL angels are 'sons' of God, including Jesus and Satan, them both being angels as well.
Again, you said:
To which one of the angels did he ( God ) call son? ( Hebrews 1:5) None
The answer to which one of the angels did he specifically call out as his 'son' is Jesus his 'firstborn' (first created/only be-gotten).
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Also, you fail to acknowledge that Jesus comes with an archangel voice, commanding his angels to gather his chosen ones together.
[ 16 because the Lord himself will descend from heaven with a commanding call, with an archangel’s voice and with God’s trumpet, and those who are dead in union with Christ will rise first. 17 Afterward we the living who are surviving will, together with them, be caught away in clouds to meet the Lord in the air; and thus we will always be with the Lord.]
[ 30 ... they will see the Son of man coming on the clouds of heaven with power and great glory. 31 And he will send out his angels with a great trumpet sound, and they will gather his chosen ones together from the four winds, from one extremity of the heavens to their other extremity.]