Devil_Hex
One thing I would love to see, is Orochimaru taking Fijin in account for his plans and instead of using Edo Tensei on First, Second and Fourth, and being prevented by Third to summon Fourth, he summons Minato separately to check Fujin, and indirectly preventing Hiruzen from preventig him to summon him, that way, that arc would be mostly the same, but there would be an extra fight Fujin vs Minato. This could lead to Fujin planning to actually save Hiruzen, but failing to do so, and would show us some character development from Fijin's part, by contrasting this situation with Mieko's What do you think?
Who ensures that the plot is fixed? He doesn't even know how he was transmigrated, he may simply be manipulated, expecting the plot to follow the same as the canon is silly. It's much smarter to manipulate him to your advantage, letting Hiruzen die would just be stupid.
GuYueFangYuan:Hiruzen is indeed his greatest supporter but knowing the plot is even more beneficial!!