Someone just said exactly this.
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The article isn't refering to players though I don't believe.
The quote "a source close to Kingsbury said...that Kingsbury hasn't received the resources he believes are necessary to win." Leads into this quote,
"...said the coach wanted to fire offensive line coach/run game coordinator Sean Kugler well before he was dismissed last month for allegedly groping a woman before a game in Mexico City, a claim Kugler is disputing through NFL arbitration.
Kugler suddenly lost opportunities to contribute to offensive planning meetings months ago, according to a source close to Kugler, but the belief from multiple Cardinals sources was that Bidwill didn't want to pay Kugler's contract buyout. Kingsbury loyalists cite the situation as evidence of the coach's limited control in Arizona."
"He knows that it's not a situation that lends itself to him being happy and successful and at his best for that organization, which he wants to be," a source close to Kingsbury said. "They won't let him. They won't let him be great."
My understanding is that resources being refered to are coaching staff control, more access to the GM, a closer working relationship on personnel etc.