The issue with Lost Souls might be that if a Lost Soul has the same skill template as the character had when they dropped, the number of skill points is far higher than a standard Lost Soul template, so when it recalculates the number of available skill points upon each time leveled up, the answer is deep in the negatives.
Lost Souls and their skills received some discussion in the past and the alternative outcome is to force them into their low-SP template like all of the other NPC types, so I wouldn't bet on this changing. If you're lucky, it will stay as it is. :p
They are considered extremely powerful compared to any other NPC type, which is potentially problematic from both a balance standpoint and from the temptation of some players to force newbie characters to drop just to seize the resulting Lost Soul.