'“It’s definitely a lot of obstacles to overcome, and it’s not easy to do,” Gronkowski said Wednesday during a conference call. “It’s not like you just turn a switch on and someone replaces them just like that … it takes time. Everyone has to come together, go out to practice, feel the chemistry out with each other and make sure everyone is paying attention, that they know what they’re doing going out to practice, making sure you’re blocking the right guy, getting the right guy and working hard together so” when game day comes, “everyone is on the same page, we’re executing as an offense and we can keep on doing what we’ve been doing.”'