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@papakarlo When way back R/E lowered the cost of promotion it became feasible to promote two squad members and it made sense back then when we had two TF events. (Edit: and the old Spark Run where high promotion was essential This was incorrect: one needed three TFs regardless of squad membership.)
Promoting two squad members gives you some leeway e.g. my Nemesis Prime was promoted to red crown and I was hesitant to promote him further until I saw the last two squad members. After the introduction of Classic Bumblebee it was relatively easy to decide to make him the number one squad member and promote Classic Bee to green crown.
After the introduction of the Spark Run v2 it started to make some sense to promote 3rd squad member – not every squad as there’s not enough good TFs. Yes, it’s debatable if it makes sense to promote the 3rd member but what is a fact is that the cost is negligible: it cost’s “only” 13,450 sparks(†) to promote a TF from zero to gold crown and “moderate” 41,950 sparks from zero to purple crown. If and when applicable you get a big increase in promotion–%.
So, for event runs it may be advantageous to promote only a single bot from a squad but for Spark Runs two bots per squad is the optimal strategy. If nothing more these two bots can be used as sponsors.
(†)
It costs 285,950 sparks to promote a TF from zero to green crown. Of that cost the gold crown is only 3.2% and the purple crown 10% but the gold crown gives you half of the total promotion–% and and the purple crown gives 67%. The last phase i.e. from the purple crown to green crown is a whopping 58.8% but this gives you “only” ⅙th of the total promotion–%.