#4 Lashley hasn't been booked as a top guy thus far
Lashley's booking has been strange, ever since he arrived in WWE for his second run. Remember the skit with the men dressed as his sisters, on RAW? Remember how, at the behest of Lio Rush, Lashley shows us his rear end on a weekly basis? I'm sorry if I made you recall sights that you worked very hard to forget.
Lashley just hasn't been presented as a Champion. And to be a credible opponent for Lesnar, you need to be presented in that manner. He hasn't even won any Championships in this run.
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I daresay that if Lashley is booked in the way that he is, it may be some time before he actually locks horns with Lesnar for the very first time. He should have been given the Strowman treatment, from the time he returned.