Sell High on Marlon Mack?

I was able to scoop Mack up off of waivers last week, and I’m wondering if his huge breakout performance is for real or just smoke and mirrors (I didn’t watch that game).

I know this level of production is obviously not sustainable, but will Mack be a quality RB2 ROS, or should I sell him now while his value might be as it will ever get?

Also, what level of player should I try to target if I’m sending out offers? I just sent one for Keenan Allen, but is there another WR or even TE right now that could be a good trade target worth more than Mack ROS?