Do Transports Matter???

I borrowed an outboard D/A from a friend to try in my system. My intent was to hook the analog outs on my CDP to one input on my preamp and the analog outs of the DAC to another input so I could a/b my player with and without the DAC. However something is wrong with the digital out on my player because I couldn't lock a siginal with the DAC. So I grabbed my pioneer DVD Player and hooked it up as a transport. Everything sounds awesome, made a big difference in my system(won't go into details). The outboard also puts the DVD players onboard DAC to shame(well duh). But this of course also made me wonder if using a different transport(my cdp if it worked)would make any difference?? In reality the DVD player is reading the CD and sending 0s and 1s to the DAC where its reclocked anyway. I know that sometimes little things make a difference, even though on paper they shouldn't. Being this is my first expirence with an outboard DAC, I am just curious if what you use as a transport makes any difference