I think paille Kelly and Campbell net a different breed of prospect or pick than soderberg or krug would. Yeah you can get a prospect or pick for half a season of a 4th line average center but would it be a good prospect? I think not. Kelly has a terrible contract and is having a terrible year. Maybe a similar (slightly better?) Return. Soderberg might ask for 4-5 million in the offseason. Would you pay him that? What if he also demands a NMC because he likes it here? Or you can trade him for a legit 2nd tier prospect or a low first/high 2nd round pick now, groom his replacement either koko or Spooner, (whoever flourishes) and have some control and a better idea what to do in the offseason. If CS stays all year, then leaves for greener pastures, what do the bruins do at 3rd line C for 2014-2015? Go in with an unknown in koko or Spooner, or look outside the organization and keep koko and spooner blocked? Trading soderberg gives them an idea what to do. If koko in an extended 25 game look goes 11-8 19 points, then I'd feel more comfortable with him as my center next year. If he goes 2-3-5, I'd probably look to add a vet.