That’s not the way I read it. True, some people are quoted as saying the system gives primary voters a choice, because they can elect the delegates who promise to vote for their preferred candidate. The problem with that theory is that when the delegates are elected there is no information about which candidate they would vote for at the convention.
I am pretty sure that when the PA primary results are known, only the 17 bound delegates will be awarded. The other 54 will remain truly unbound, and free to vote for whomever they wish at the convention. These 54 will not count toward the 1237 benchmark.
As I have said, they may feel pressure to vote for Trump if he was the clear winner of the state. I hope so.
Maybe so with PA. So complicated.
Anyway it seems clear from the RCP notes that the delegates from CO and WY can choose to be bound or unbound.
“Colorado1, Wyoming1
Delegates in Colorado are selected through a process that starts with the March 1st caucuses and culminates at the state convention on April 9th. Colorado Delegates can go to the national convention as unbound or bound to a candidate. The Wyoming precinct caucuses on March 1st do not bind any delegates, but they start a delegate selection process that culminates at the state convention on April 14-16. Delegates from Wyoming can be bound or unbound.”
http://www.realclearpolitics.com/epolls/2016/president/republican_delegate_count.html