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Interesting and revealing Chalk Talk by Brock Huard contends that there was nothing wrong with the play call. In fact Seattle with the play call created a situation that was exactly what any coach or offensive coordinator would want, a 4-on-4 mano-a-mano contest between the O-line and two DT's plus two LB's. The problem was the Hawks simply got whipped up front. If you watch the replay this is clear.
Huard's chalk talk: http://mynorthwest.com/292/2811158/Brock-Huards-Chalk-Talk-Why-Seahawks-...
Watch the play: http://www.seahawks.com/video/2015/09/13/rams-stop-seahawks-4th-down-ot
Gilliam gets absolutely destroyed on the play, and that blows it up.