“How then would the scriptures be fulfilled that thus it was necessary for it to be?”
For if angels (or even puny men) intervened, how could the Scriptures be fulfilled which said that this had to happen (Isaiah 50:6; Isaiah 53:8)? This emphasis of the fulfilment of Scripture to the full is common in Matthew. Note the element of divine necessity. This treatment that He was receiving had been long known to Him and had been recently confirmed to Him in Gethsemane.