The Hemed and Murray partnership didn't work in the Championship so no reason to expect it will work in the Prem.
I can't see Ulloa and Hemed working for similar reasons.
I don't see that having all 3 striker makes sense either - none of them are particularly fast. You obviously keep Murray...
For me, Murray is our best forward, but he obviously won't give you 90 mins x 38 matches. Secondly, Hemed can't give you what Murray can - height, physical presence, Prem experience and his quality of finishing. To me it makes sense to get a like for like replacement for Murray so you can...
With the signing of Brown and the possibility of Lawrence coming in then the chances of playing one up top look increasingly likely.
Is it worth going back in for Ulloa? With plenty of pace around him and plenty of good crossers in the squad he'd be a decent target man and bring others into...