garychopper wrote: ↑30 May 2017, 12:24
The last one where they kept valteri stint too long to block Sebastian. No?
Yes,
but was he compromised?
Lets recap the situation of Barcelona:
1.) Barcelona is notoriously hard to overtake. This is important because...
2.) ...a 2 stop is theoretically faster, but sometimes, a 1 stop may be more beneficial due to track position (see Wehrlein's race)
Mercedes lured Ferrari into pitting Vettel early (lap 14). Vettel pitted for options again, thus it was clear that Ferrari had to stop again. Mercedes stayed out and brought Lewis in on Lap 21 for the prime-tire. This meant that a 1-stop would have been theoretically possible, though very challenging and the question would be at what pace? At that point, Bottas was comfortably sitting in 3rd, with both VER and RAI out of the race. His only challenger was Ricciardo running a distant 4th who had also just pitted on lap 21. Before RIC pitted, the gap from Bottas to Ricciardo was 16.2 seconds. Lets call this his "buffer".
Lets look at some lap times:
Lap 20: HAM: 1:26.446, BOT: 1:27.236, RIC: 1:27.685
Lap 21: HAM: (PIT), BOT: 1:28.315, RIC: (PIT)
Lap 22: HAM: (OL), BOT: 1:27.825, RIC: (OL)
Lap 23: HAM: 1:25.444, BOT: 1:27.415, RIC: 1:26.068
Lap 24: HAM: 1:26.283, BOT: 1:28.429, RIC: 1:26.365
Lap 25: HAM: 1:26.351, BOT: 1:29.776, RIC: 1:26.191
Lap 26: HAM: 1:25.501, BOT: (PIT), RIC: 1:26.352
What we can see here is that Bottas had a very comfortable margin over Ricciardo in 4th. He was consistently running slower than both HAM and VET throughout the 1st stint, but quicker than Ricciardo before RedBull pitted him. When RedBull pitted Ricciardo, they pitted him for primes (just like Hamilton). Between then and when they pitted Bottas (5 laps), Bottas lost around 10 seconds towards Ricciardo. Thus when Bottas rejoined into Lap 27, he still had a gap of 6.4 seconds.
No doubt, keeping Bottas helped Lewis in holding up Vettel. But didn't it help Bottas himself too? At that point, he was actually battling for position with Vettel. Assuming Vettel had not found a way past Bottas, Vettels race would have been substantially compromized. Bottas only needed to cover Ricciardo who was on the same strategy. A 1-stop not out of the question. Hold up Vettel for as long as possible and then pit at the latest moment before Ricciardo would be ahead and then go long on the mediums till the end. The question then would have been if Bottas could have stayed within a gap of less than a pitstop to Vettel. If yes, Vettel would have needed to pass Bottas for position later in the race.
Did it help Lewis's race? Absolutely. Did it compromise Bottas? Not at all. In fact, I would say the clear opposite. There was no risk from behind, as there was a healthy margin to Ricciardo (16.2 seconds by Lap 20). Bottas was clearly running slower than both Hamilton and Vettel throughout the first stint, so his only chance of gaining a position was to 1-stop and use track position as an advantage. That would have only worked though if he would have successfully kept Vettel behind.
There was nothing to gain by pitting Bottas earlier, as he never had the pace of Vettel or Hamilton and was already 10.7 seconds behind by lap 20.
For reference sake: Wehrlein stopped on lap 33 for his one-stop race.
So no, it didn't compromise his race in the slightest but gave himself, Lewis and the team Mercedes a good shot of gaining a position.