Don't know why you are referencing the KJB when the reading of 'power' is rendered in all English translations, and accepted by the Church, as 'power'.
Because the KJV rendered the same underlying word as "power" and "authority" many times, and you just pointed to the NIV doing the same.
Were they all anti-Trinitarian? The word ἐξουσία primarily means authority, jurisdiction, influence, etc.
For just pure "power" there is a different word, δύναμις, where we get our word "dynamo" from.
You can see an example below where both are used in the same verse, here in the KJV:
Luk 9:1 Then he called his twelve disciples together, and gave them power (δύναμιν) and authority (ἐξουσίαν) over all devils, and to cure diseases.
Smith and Hort changed it to the lesser value as though Jesus had no power of his own. NIV was only following the footsteps of them. Certainly you don't deny that Smith had an agenda?
Of course Smith had an agenda. But he also claimed the others had a TRINITARIAN agenda which he was constantly battling. And he frankly admitted times when he made no effort to change a plainly Trinitarian reading because there was no textual warrant. And the times he tried to change them were when he thought he did have a textual warrant.
Now I just quoted that Smith thought "authority" meant a given power, whereas power meant innate.
Neither he, nor you, nor anyone else has to argue over such a silly thing. First because the KJV, the NIV, etc. all have translated the word both ways. But more importantly because Jesus said Himself He was GIVEN the power.
Mat 28:18 And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.
There is no point in arguing about whether "authority" means delegated power, and "power" means innate power when He says point blank the power was given to Him right in the text.
