I haven't said so.
The snakes were sent, it seems, as a punishment for their complaints.
Since Jesus's analogy is not focused on this part of the story then I assumed I need not either.
If you are going go down this path, why stop there? Why not speculate also about what the snakes represent, the relevance of Moses raising the serpent and that the story was set in the wilderness?
Jesus restricts His analogy to nothing but dying Israelites who need a cure.
Because Jesus was not saying they were not sick in terms of their state of sin.
I see no relevance of Mat. 9 to the analogy.
Moses status is excluded from the analogy so why speculate? Jesus limits the scope Himself:
Source
1. Bitten Israelites about to die
2. Bronze serpent raised on a pole
3. Israelites looking at the serpent and living
Target
1. Sinful humanity heading for eternal hell
2. Jesus crucified
3. People believing Jesus for eternal life
Well, other than that other obvious, I would agree with that breakdown there.
This obvious - "at that time" Eph. 2...
Target
1. Sinful ISRAEL heading for eternal hell
2. Jesus crucified
3. ISRAEL believing Jesus for eternal life
Matthew 15:24 But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
And...
Ephesians 2:11 Wherefore remember, that ye being in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands; 2:12 That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world: 2:13 But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.
Verse 13 referring to things after this was pronounced...
Romans 11:7 What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded.
11:11 I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy. 11:12 Now if the fall of them be the riches of the world, and the diminishing of them the riches of the Gentiles; how much more their fulness?
11:25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
Not that that now excluded Israelites - from this even now GENTILE salvation...
Romans 11:30 For as ye in times past have not believed God, yet have now obtained mercy through their unbelief: 11:31 Even so have these also now not believed, that through your mercy they also may obtain mercy. 11:32 For God hath concluded them all in unbelief, that he might have mercy upon all.
The meaning of verse 32 there?
This here...
Romans 3:9 What then? are we better than they? No, in no wise: for we have before proved both Jews and Gentiles, that they are all under sin; 3:10 As it is written, There is none righteous, no, not one: 3:11 There is none that understandeth, there is none that seeketh after God.
Nevertheless, Rom. 14:5; 5:7,8.