I give Gurriel a pass more than Biggio because I feel Gurriel has better tools to become a very good hitter. I don't have that same faith in Biggio even though he is definitely better than how he's performing at the moment.
Biggio's best skillset is to be a table setter by taking pitches and walks for the big boys behind him. With Springer occupying the leadoff spot for the foreseeable future, Biggio best attribute reduces greatly on the team. He has tried to be more aggressive this season to become a better run producer given his spot in the lineup but that has been a failure to this point. This is something I don't see changing that much so he should stick to what's gotten to this level regardless of where he's batting.