Isn't this contradictory to Matthew 28:18, where Jesus says, All power is given unto me in heaven and in earth? No -- "all power" in these passages means the ability to do certain supernatural feats. The "lawless one" will be allowed to do when he/she/it comes. Just because two people have the same quality/property does not mean they are the same, nor does the use "all power" by two persons mean the usage is mutually exclusive. Moreover, two different Greek words are in use: exousia in Matthew, which has the connotation of authority, and dunamis in 2 Thess., which merely refers to miracle-working power.

Well, how about Ps. 136:9, which says "To him who alone doeth great wonders..."? The adjective "great" -- not used in 2 Thess. -- makes all the difference. Others can do smaller wonders. Only God does great ones. (Note that the list following in Psalms is of miracles of creation of the earth and heavens.)