In your situation, the flanker's block must be a) in front, b) above the waist, and c) not combined with a below-the-waist block by the TE in order to be legal.
If one of those three components isn't met, you'd have a) an IBB, b) an illegal BBW, or c) a chop block.
b) could also be a chop block if combined with an above-the-waist block by the TE.
Also, it's important to note that any flanker in motion towards the ball at the snap is going to draw attention from the wing official and/or back judge, specifically looking for illegal blocks by the flanker.
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