"If Bingley consulted Darcy at all, all available evidence is that he disregarded his advice and wishes in order to go to Hertfordshire to rent Netherfield. "
I didn't read any indication that darcy disagreed in any way with this project.
To him, it was logistically a (probably) welcome halt between his houses in London and Pemberley, in addition.
And, chapter 4 :
"Between him and Darcy there was a very steady friendship, in spite of a great opposition of character. -- Bingley was endeared to Darcy by the easiness, openness, ductility of his temper, though no disposition could offer a greater contrast to his own, and though with his own he never appeared dissatisfied. On the strength of Darcy's regard Bingley had the firmest reliance, and of his judgment the highest opinion. In understanding, Darcy was the superior. Bingley was by no means deficient, but Darcy was clever."
Of course one cannot yet quote chapters later beyond the twelfth but I think this is sufficient. We have a framework by the omniscient narrator, and dialogues to see a bit of how it happen day after day. And if you think that in these dialogues Bingley was the leader, well, I don't know what to say...