I can hear the crowd chanting: Sell it! Sell it! Sell it!
Look,,, simply and plainly,,,, if you fight manually,,,, then Champs serve their purpose perfectly,,, lead with a champ,,, let that die 1st,,,, and then the rest of your troops get a little boost,,, as far as deleting / upgrading is concerned,,, using a one up kit for each age/era is negligable,,,, I myself am in SAAB era on my main world and do most of my fighting in auto, so I myself have no use for champs at all and have removed it,,,, but if you choose to do that,,,, do yourself 1 favour,,,, use a Store Item then sell it in Antiques Dealer