Does the pool mining have advantage over solo mining?
Just have some time reading the miner code.

I saw in BibleMiner
   in nonce loop            if ((pblock->nNonce & 0x7FFF) == 0)
                                  break;
       out of the loop                            if (pblock->nNonce >= 0xFF)                    
                                                               break;
 So anything after the above statement will be ignored (pblock->nNonce will be 0x8000 which is always > 0xFF):
                // Update nTime every few seconds
             if (pindexPrev)
            {
               if (UpdateTime(pblock, chainparams.GetConsensus(), pindexPrev) < 0)
                  break; // Recreate the block if the clock has run backwards,
                        // so that we can use the correct time.
            }
 The miner cannot just update the ntime to create a new task without createnewblock?