Why didn't he sin? Heb 4:15.
If you are right--that Jesus could have sinned--then he's no great high priest.
For such a High Priest was fitting for us, rwho is holy, harmless, undefiled, separate from sinners, sand has become higher than the heavens; who does not need daily, as those high priests, to offer up sacrifices, first for His town sins and then for the people’s, for this He did once for all when He offered up Himself. For the law appoints as high priests men who have weakness, but the word of the oath, which came after the law, appoints the Son who has been perfected forever. r [2 Cor. 5:21]; Heb. 4:15
9 innocent
s Eph. 1:20
t Lev. 9:7; 16:6; Heb. 5:3The New King James Version. Nashville : Thomas Nelson, 1982, S. Heb 7:26-28
7:26–28 "Christ’s divine and holy character is yet another proof of the superiority of His priesthood..." Heb 7:26
"Only God is inherently righteous (Deut. 32:4; Job 9:2; Pss. 11:7; 116:5; John 17:25; Rom. 3:10; 1 John 2:1; Rev. 16:5), and man falls woefully short of the divine standard of moral perfection (3:23; Matt. 5:48). But the gospel reveals that on the basis of faith—and faith alone—God will impute His righteousness to ungodly sinners (see notes on 3:21–24; 4:5; 2 Cor. 5:21; Phil. 3:8, 9). from faith to faith..." Ro 1:17
"3:21–5:21 Having conclusively proved the universal sinfulness of man and his need for righteousness (1:18–3:20), Paul develops the theme he introduced in 1:17, i.e., God has graciously provided a righteousness that comes from Him on the basis of faith alone (3:21–5:21)."
MacArthur, John Jr: The MacArthur Study Bible. electronic ed. Nashville : Word Pub., 1997, c1997, S. Ro 3:21