Why Is a Player Designated for Assignment, and then Optioned to the Minors?

There seems to be some confusion (not here, but elsewhere) about why a player would be Designated for Assignment (DFA), and then subsequently be optioned to the minors. 

Gift of Five Giant Errors Much Appreciated by AZL Cubs

Michael Foster belted an opposite-field line-drive RBI triple into the RF corner and Carlos Jimenez drilled a line-drive RBI single to center to highlight a two-run 4th, and Carlos Sepulveda rifled an RBI single through the box and into CF (his third hit of the game) to cap a three-run 6th, helping the AZL Cubs to a 5-1 victory over the AZL Giants in Arizona League action Monday night at Sloan Park in Mesa, AZ. . 

Higgins, Willis, and Dwyer Recipe for Success for AZL Cubs

P. J. Higgins (Cubs 2015 12th round draft pick - Old Dominion U.) drilled three singles, drove-in two runs, stole a base, and scored twice, leading the AZL Cubs to a 7-3 victory over the AZL Giants in Arizona League action Sunday night at Indian School Park Field #2 in Scottsdale, AZ.

Want to Make a Trade After the Trade Deadline Passes? You Need Trade Assignment Waivers

The deadline for "non-waiver" (unrestricted) trades is 4 PM (Eastern) on July 31st. No trades can be made between 4 PM and 5 PM (Eastern) on July 31st, and then beginning at 5 PM (Eastern) on July 31st and extending through to the conclusion of the MLB regular season,

Trade Assignment Waivers must be secured before players on MLB 40-man rosters can be traded. (Waivers are never required to trade a player on a minor league reserve list).

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