Yep your right “angels here and not angles” angels.
Yes moral support makes some sense and fits into the traditional understanding that they fall into this meaning “A servant; a subordinate; an officer or assistant of inferior rank; hence, an agent, an instrument.”
So, would this not then be point to intersession. After all the argument from others is God/Jesus knows it all and is all powerful, yet this supports the point he lends his ear to others. In this case to strengthen him for the ordeal and the fact he was in flesh form. Or as just another open example he did to Abraham and is capable to changes his intent due to others.
Now the case could be made that in the verse with the angels they were saying supporting things vice asking for help, but it does address one concern often brought up by other denominations in that the heavenly host / the dead do not have any say with the Lord. They obvious do and to believe this interaction from the ones the Lord loves and would not support requests from them is week and blindsided when you consider the love the Lord our God has for us and them.
Intercessory prayer asks for help. I believe the angels came too Jesus of their own accord. After all, he was the Son of Man, the Son of God.
Caucus
The Early Church Fathers on Intercession of the Saints - Catholic/Orthodox Caucus
How do you pray?
How (and Why) of Daily Prayer
Passionate Prayer – Part Two
Passionate Prayer – Part One
Prayer the Great Means of Salvation: Ch.1: The Necessity of Prayer, Sect. 3 Invocation of the Saints
Pray Always
The Mystery and Power of Personal Prayer
The Three Ways of Attention and Prayer; Orthodox/Catholic Caucus
Lesson One in Prayer
Prayer and Suffering
Prayer, Charity and the Joy of Forgiveness (some spiritual catechesis from Cardinal Sean)
Does Prayer Work?--Research and ‘Unanswered’ Prayer
Long-Awaited Medical Study Questions the Power of Prayer
The Power of Prayer
Prayer Study: Humans Fail to Manipulate God
Study fails to show healing power of prayer
Explanation of the Prayer of Saint Michael [Father Robert J. Altier]
24-7 prayer movement spreads on college campuses
Confession for RCIA Candidates And More on the Prayer of the Faithful