I wouldn't preallocate for investors. It's too unpredictable. Employees, sure.
Is it that you want to be able to say to your team members, "you have X% in the worst case" ? I don't think it's practical to make such a statement if you're going down a fundraising path. At best you might be able give a near term worst case, based on the next round or two (e.g. apply the high side of Sam's seed/A dilution ranges). It's all guesswork though, and even with a preallocation you might need to exceed it.
Is it that you want to be able to say to your team members, "you have X% in the worst case" ? I don't think it's practical to make such a statement if you're going down a fundraising path. At best you might be able give a near term worst case, based on the next round or two (e.g. apply the high side of Sam's seed/A dilution ranges). It's all guesswork though, and even with a preallocation you might need to exceed it.