The TP guys will be welcome to share the workload in EK, simple.
As to their professionalism as a pilot, no different than any EK pilot.
As to the experience of an EK pilot. All EK pilots prior to joining had Jet time, Wide body time (perhaps), Global route experience (likely), a proven ability to adapat for the EK mould to fly jets on global/international routes.
As to the experience of the TP pilot. These guys are often going to be younger in their career than the previous EK applicant and might be more adaptable than the pilots who came to EK with jet time who were possibly older. The TP guys will have a beyond vertical learning curve as they will have to learn the "Jet" way of flying, the "Global" route structures, the new Med Haul and Long Haul work regime and associated fatigue issues. Also to be learnt will be the EK way of doing things and for those going to any Airbus, sidestick handling. A tall ask YES, impossible, NO. Give these guys a break and let us see how this plays out.
The only issue for the EK guys in particular will be the fact that every flight with a new TP guy is going to be a training flight for the TPs first year or more in EK and this will mean that the EK Captain is going to have to be even more aware than normal or the 'tea and biscuits" trip is inevitable + letters + cash loss (no bonus etc or upgrade if multicrew).
Time will tell, only the results will settle this one out so lets wait and see.
J