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Not really shirk! Saying that Muhammad (SAW) and Muslims believe that Isa (AS) too spoke the Words of God. When classifying things and instructing things they did so out of Divine guidance and inspiration. The words are attributed to God. There are clear parts that are not attributed to God in hadith too.

They are in the following order:

The Word of God
The Divinely Inspired Saying of Muhammad (SAW)
The Saying of The Guided Prophet (SAW)

Each of these have their own authority, but none of them carry no authority. Most cases of explanatory hadith of Qur'anic verses are in the thired category.

The Qudsi hadith are of the second order which is a vision or instruction that becomes implanted for the prophet to say in his own words (SAW). No power of God is attributed to Muhammad (SAW) therefore there is no shirk element here, but those who wish to transgress the limits often find themselves in this area.