Check out ICE* guides on stackable and none stackable buffs, with the general trend of same round length buffs will not stack there similar portion, the unique aspects will though. I.e shields and leech with iruka and guy. Also a more effective but p2w setup would be 3 po1 edo hiruzens, with each having either edo asuma or wb asuma, an edo sasori, an edo Tobirama with bond link, a breakthrough hashirama, and 3 mains of choose, with fire mains or earth mains being generally good choices. This leads to 40% from barrier, 40% from hiruzen, 45% nin from 3 firemain, 30% from the asumas, 30%nin from the hashirama, 30% from sasori, leading to a buff of 215% nin and 140% attack on three edo hiruzen. Now where this has advantage is that unless the enemy has an interrupt ninja at po1 thats faster than you, all 3 Hiruzens c*e there mystery first thing thus very limiting counter options, with the added benefit that if no 5k madara or kisame are on the field, or just a really fast po2, the sasori can give double attacks too the 8 edo units and 1 additional. Another option is to use hokage minato instead of hashirama for 30% less nin but a 40% increase in resitance. Its not a flawless setup, but it will rough up your enemies quite well in most cases and harder to shutdown th*ot of other setups, since again the only way to stop it is to both have a faster po1 and also sacrifice that spot with something like 5 k madara.