Actually it is. Here's a breakdown:
Point 1 - LIterally tipped the puck before Marner circled the ice.
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Point 3 - Sandin does a really good job of breaking up the rush up the ice in the neutral zone. Heads back the other way. Buntin and Marner start a very good passing play and Matthews finishes it off with a great pass from Marner.
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Point 2 - Matthews passes back to Rielly. Rielly walks the line and passes to Marner. Marner scores.
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Point 4 - Bunting gets in alone on a forecheck. Puck gets turned over and Marner stops the breakout. Passes the puck to Matthews and he bats it in.
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I'm not saying that Matthews is irrelevant, but he is a huge benefactor of playing with Marner.
Edit: I put the 2nd and 3rd points out of order. I know. I don't know how to switch it. lol
The point still remains that all of Matthews points in the last 3 games have been directly impacted by Marner.