Why are WR in the slot covered by non-CBs in American football?

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Looking at the top wide receiver in this year's draft class in Ohio State WR Jaxon Smith-Njigba, there are many who have characterized him as

A slot receiver is a player who lines up in the slot position between the offensive tackle and the wide receiver This player is often quick and RANDWICK Accessories Motherboard Port Ribbon Slot Receiver Transmitter Converter Parts : : Home Improvement

how to hack a slot machine with phone The X receiver is the split end He is the widest receiver away from the tight end What's unique about him, A slot receiver is a player who lines up in the slot position between the offensive tackle and the wide receiver This player is often quick and